20804420

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{71}}^1$

素因数の和:130

約数の個数: 144

約数和(自身を含む): 57915648

約数和(自身を除く): 37111228

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 23, 26, 28, 35, 46, 49, 52, 65, 70, 71, 91, 92, 98, 115, 130, 140, 142, 161, 182, 196, 230, 245, 260, 284, 299, 322, 355, 364, 455, 460, 490, 497, 598, 637, 644, 710, 805, 910, 923, 980, 994, 1127, 1196, 1274, 1420, 1495, 1610, 1633, 1820, 1846, 1988, 2093, 2254, 2485, 2548, 2990, 3185, 3220, 3266, 3479, 3692, 4186, 4508, 4615, 4970, 5635, 5980, 6370, 6461, 6532, 6958, 8165, 8372, 9230, 9940, 10465, 11270, 11431, 12740, 12922, 13916, 14651, 16330, 17395, 18460, 20930, 21229, 22540, 22862, 25844, 29302, 32305, 32660, 34790, 41860, 42458, 45227, 45724, 57155, 58604, 64610, 69580, 73255, 80017, 84916, 90454, 106145, 114310, 129220, 146510, 148603, 160034, 180908, 212290, 226135, 228620, 293020, 297206, 320068, 400085, 424580, 452270, 594412, 743015, 800170, 904540, 1040221, 1486030, 1600340, 2080442, 2972060, 4160884, 5201105, 10402210, 20804420]

約数ペア:

[(1, 20804420), (2, 10402210), (4, 5201105), (5, 4160884), (7, 2972060), (10, 2080442), (13, 1600340), (14, 1486030), (20, 1040221), (23, 904540), (26, 800170), (28, 743015), (35, 594412), (46, 452270), (49, 424580), (52, 400085), (65, 320068), (70, 297206), (71, 293020), (91, 228620), (92, 226135), (98, 212290), (115, 180908), (130, 160034), (140, 148603), (142, 146510), (161, 129220), (182, 114310), (196, 106145), (230, 90454), (245, 84916), (260, 80017), (284, 73255), (299, 69580), (322, 64610), (355, 58604), (364, 57155), (455, 45724), (460, 45227), (490, 42458), (497, 41860), (598, 34790), (637, 32660), (644, 32305), (710, 29302), (805, 25844), (910, 22862), (923, 22540), (980, 21229), (994, 20930), (1127, 18460), (1196, 17395), (1274, 16330), (1420, 14651), (1495, 13916), (1610, 12922), (1633, 12740), (1820, 11431), (1846, 11270), (1988, 10465), (2093, 9940), (2254, 9230), (2485, 8372), (2548, 8165), (2990, 6958), (3185, 6532), (3220, 6461), (3266, 6370), (3479, 5980), (3692, 5635), (4186, 4970), (4508, 4615)]