20517640

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{211}}^1$

素因数の和:263

約数の個数: 128

約数和(自身を含む): 57697920

約数和(自身を除く): 37180280

約数列:

[1, 2, 4, 5, 8, 10, 11, 13, 17, 20, 22, 26, 34, 40, 44, 52, 55, 65, 68, 85, 88, 104, 110, 130, 136, 143, 170, 187, 211, 220, 221, 260, 286, 340, 374, 422, 440, 442, 520, 572, 680, 715, 748, 844, 884, 935, 1055, 1105, 1144, 1430, 1496, 1688, 1768, 1870, 2110, 2210, 2321, 2431, 2743, 2860, 3587, 3740, 4220, 4420, 4642, 4862, 5486, 5720, 7174, 7480, 8440, 8840, 9284, 9724, 10972, 11605, 12155, 13715, 14348, 17935, 18568, 19448, 21944, 23210, 24310, 27430, 28696, 30173, 35870, 39457, 46420, 46631, 48620, 54860, 60346, 71740, 78914, 92840, 93262, 97240, 109720, 120692, 143480, 150865, 157828, 186524, 197285, 233155, 241384, 301730, 315656, 373048, 394570, 466310, 512941, 603460, 789140, 932620, 1025882, 1206920, 1578280, 1865240, 2051764, 2564705, 4103528, 5129410, 10258820, 20517640]

約数ペア:

[(1, 20517640), (2, 10258820), (4, 5129410), (5, 4103528), (8, 2564705), (10, 2051764), (11, 1865240), (13, 1578280), (17, 1206920), (20, 1025882), (22, 932620), (26, 789140), (34, 603460), (40, 512941), (44, 466310), (52, 394570), (55, 373048), (65, 315656), (68, 301730), (85, 241384), (88, 233155), (104, 197285), (110, 186524), (130, 157828), (136, 150865), (143, 143480), (170, 120692), (187, 109720), (211, 97240), (220, 93262), (221, 92840), (260, 78914), (286, 71740), (340, 60346), (374, 54860), (422, 48620), (440, 46631), (442, 46420), (520, 39457), (572, 35870), (680, 30173), (715, 28696), (748, 27430), (844, 24310), (884, 23210), (935, 21944), (1055, 19448), (1105, 18568), (1144, 17935), (1430, 14348), (1496, 13715), (1688, 12155), (1768, 11605), (1870, 10972), (2110, 9724), (2210, 9284), (2321, 8840), (2431, 8440), (2743, 7480), (2860, 7174), (3587, 5720), (3740, 5486), (4220, 4862), (4420, 4642)]