20988760

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{181}}^1\times {\mathrm{223}}^1$

素因数の和:428

約数の個数: 64

約数和(自身を含む): 51367680

約数和(自身を除く): 30378920

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 181, 223, 260, 362, 446, 520, 724, 892, 905, 1115, 1448, 1784, 1810, 2230, 2353, 2899, 3620, 4460, 4706, 5798, 7240, 8920, 9412, 11596, 11765, 14495, 18824, 23192, 23530, 28990, 40363, 47060, 57980, 80726, 94120, 115960, 161452, 201815, 322904, 403630, 524719, 807260, 1049438, 1614520, 2098876, 2623595, 4197752, 5247190, 10494380, 20988760]

約数ペア:

[(1, 20988760), (2, 10494380), (4, 5247190), (5, 4197752), (8, 2623595), (10, 2098876), (13, 1614520), (20, 1049438), (26, 807260), (40, 524719), (52, 403630), (65, 322904), (104, 201815), (130, 161452), (181, 115960), (223, 94120), (260, 80726), (362, 57980), (446, 47060), (520, 40363), (724, 28990), (892, 23530), (905, 23192), (1115, 18824), (1448, 14495), (1784, 11765), (1810, 11596), (2230, 9412), (2353, 8920), (2899, 7240), (3620, 5798), (4460, 4706)]