20988640

素因数分解:

$2^5\times 5^1\times {\mathrm{233}}^1\times {\mathrm{563}}^1$

素因数の和:811

約数の個数: 48

約数和(自身を含む): 49886928

約数和(自身を除く): 28898288

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 233, 466, 563, 932, 1126, 1165, 1864, 2252, 2330, 2815, 3728, 4504, 4660, 5630, 7456, 9008, 9320, 11260, 18016, 18640, 22520, 37280, 45040, 90080, 131179, 262358, 524716, 655895, 1049432, 1311790, 2098864, 2623580, 4197728, 5247160, 10494320, 20988640]

約数ペア:

[(1, 20988640), (2, 10494320), (4, 5247160), (5, 4197728), (8, 2623580), (10, 2098864), (16, 1311790), (20, 1049432), (32, 655895), (40, 524716), (80, 262358), (160, 131179), (233, 90080), (466, 45040), (563, 37280), (932, 22520), (1126, 18640), (1165, 18016), (1864, 11260), (2252, 9320), (2330, 9008), (2815, 7456), (3728, 5630), (4504, 4660)]