21372640

素因数分解:

$2^5\times 5^1\times {\mathrm{31}}^2\times {\mathrm{139}}^1$

素因数の和:216

約数の個数: 72

約数和(自身を含む): 52549560

約数和(自身を除く): 31176920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 80, 124, 139, 155, 160, 248, 278, 310, 496, 556, 620, 695, 961, 992, 1112, 1240, 1390, 1922, 2224, 2480, 2780, 3844, 4309, 4448, 4805, 4960, 5560, 7688, 8618, 9610, 11120, 15376, 17236, 19220, 21545, 22240, 30752, 34472, 38440, 43090, 68944, 76880, 86180, 133579, 137888, 153760, 172360, 267158, 344720, 534316, 667895, 689440, 1068632, 1335790, 2137264, 2671580, 4274528, 5343160, 10686320, 21372640]

約数ペア:

[(1, 21372640), (2, 10686320), (4, 5343160), (5, 4274528), (8, 2671580), (10, 2137264), (16, 1335790), (20, 1068632), (31, 689440), (32, 667895), (40, 534316), (62, 344720), (80, 267158), (124, 172360), (139, 153760), (155, 137888), (160, 133579), (248, 86180), (278, 76880), (310, 68944), (496, 43090), (556, 38440), (620, 34472), (695, 30752), (961, 22240), (992, 21545), (1112, 19220), (1240, 17236), (1390, 15376), (1922, 11120), (2224, 9610), (2480, 8618), (2780, 7688), (3844, 5560), (4309, 4960), (4448, 4805)]