20557840

素因数分解:

$2^4\times 5^1\times {\mathrm{313}}^1\times {\mathrm{821}}^1$

素因数の和:1147

約数の個数: 40

約数和(自身を含む): 48008088

約数和(自身を除く): 27450248

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 313, 626, 821, 1252, 1565, 1642, 2504, 3130, 3284, 4105, 5008, 6260, 6568, 8210, 12520, 13136, 16420, 25040, 32840, 65680, 256973, 513946, 1027892, 1284865, 2055784, 2569730, 4111568, 5139460, 10278920, 20557840]

約数ペア:

[(1, 20557840), (2, 10278920), (4, 5139460), (5, 4111568), (8, 2569730), (10, 2055784), (16, 1284865), (20, 1027892), (40, 513946), (80, 256973), (313, 65680), (626, 32840), (821, 25040), (1252, 16420), (1565, 13136), (1642, 12520), (2504, 8210), (3130, 6568), (3284, 6260), (4105, 5008)]