21137840

素因数分解:

$2^4\times 5^1\times {\mathrm{163}}^1\times {\mathrm{1621}}^1$

素因数の和:1797

約数の個数: 40

約数和(自身を含む): 49477488

約数和(自身を除く): 28339648

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 163, 326, 652, 815, 1304, 1621, 1630, 2608, 3242, 3260, 6484, 6520, 8105, 12968, 13040, 16210, 25936, 32420, 64840, 129680, 264223, 528446, 1056892, 1321115, 2113784, 2642230, 4227568, 5284460, 10568920, 21137840]

約数ペア:

[(1, 21137840), (2, 10568920), (4, 5284460), (5, 4227568), (8, 2642230), (10, 2113784), (16, 1321115), (20, 1056892), (40, 528446), (80, 264223), (163, 129680), (326, 64840), (652, 32420), (815, 25936), (1304, 16210), (1621, 13040), (1630, 12968), (2608, 8105), (3242, 6520), (3260, 6484)]