21977020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{181}}^1\times {\mathrm{467}}^1$

素因数の和:670

約数の個数: 48

約数和(自身を含む): 50083488

約数和(自身を除く): 28106468

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 181, 260, 362, 467, 724, 905, 934, 1810, 1868, 2335, 2353, 3620, 4670, 4706, 6071, 9340, 9412, 11765, 12142, 23530, 24284, 30355, 47060, 60710, 84527, 121420, 169054, 338108, 422635, 845270, 1098851, 1690540, 2197702, 4395404, 5494255, 10988510, 21977020]

約数ペア:

[(1, 21977020), (2, 10988510), (4, 5494255), (5, 4395404), (10, 2197702), (13, 1690540), (20, 1098851), (26, 845270), (52, 422635), (65, 338108), (130, 169054), (181, 121420), (260, 84527), (362, 60710), (467, 47060), (724, 30355), (905, 24284), (934, 23530), (1810, 12142), (1868, 11765), (2335, 9412), (2353, 9340), (3620, 6071), (4670, 4706)]