20525000

素因数分解:

$2^3\times 5^5\times {\mathrm{821}}^1$

素因数の和:852

約数の個数: 48

約数和(自身を含む): 48160980

約数和(自身を除く): 27635980

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 625, 821, 1000, 1250, 1642, 2500, 3125, 3284, 4105, 5000, 6250, 6568, 8210, 12500, 16420, 20525, 25000, 32840, 41050, 82100, 102625, 164200, 205250, 410500, 513125, 821000, 1026250, 2052500, 2565625, 4105000, 5131250, 10262500, 20525000]

約数ペア:

[(1, 20525000), (2, 10262500), (4, 5131250), (5, 4105000), (8, 2565625), (10, 2052500), (20, 1026250), (25, 821000), (40, 513125), (50, 410500), (100, 205250), (125, 164200), (200, 102625), (250, 82100), (500, 41050), (625, 32840), (821, 25000), (1000, 20525), (1250, 16420), (1642, 12500), (2500, 8210), (3125, 6568), (3284, 6250), (4105, 5000)]