21205880

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12329}}^1$

素因数の和:12383

約数の個数: 32

約数和(自身を含む): 48826800

約数和(自身を除く): 27620920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12329, 24658, 49316, 61645, 98632, 123290, 246580, 493160, 530147, 1060294, 2120588, 2650735, 4241176, 5301470, 10602940, 21205880]

約数ペア:

[(1, 21205880), (2, 10602940), (4, 5301470), (5, 4241176), (8, 2650735), (10, 2120588), (20, 1060294), (40, 530147), (43, 493160), (86, 246580), (172, 123290), (215, 98632), (344, 61645), (430, 49316), (860, 24658), (1720, 12329)]