21237560

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4871}}^1$

素因数の和:4991

約数の個数: 32

約数和(自身を含む): 48232800

約数和(自身を除く): 26995240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 4871, 9742, 19484, 24355, 38968, 48710, 97420, 194840, 530939, 1061878, 2123756, 2654695, 4247512, 5309390, 10618780, 21237560]

約数ペア:

[(1, 21237560), (2, 10618780), (4, 5309390), (5, 4247512), (8, 2654695), (10, 2123756), (20, 1061878), (40, 530939), (109, 194840), (218, 97420), (436, 48710), (545, 38968), (872, 24355), (1090, 19484), (2180, 9742), (4360, 4871)]