21705160

素因数分解:

$2^3\times 5^1\times {\mathrm{431}}^1\times {\mathrm{1259}}^1$

素因数の和:1701

約数の個数: 32

約数和(自身を含む): 48988800

約数和(自身を除く): 27283640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 431, 862, 1259, 1724, 2155, 2518, 3448, 4310, 5036, 6295, 8620, 10072, 12590, 17240, 25180, 50360, 542629, 1085258, 2170516, 2713145, 4341032, 5426290, 10852580, 21705160]

約数ペア:

[(1, 21705160), (2, 10852580), (4, 5426290), (5, 4341032), (8, 2713145), (10, 2170516), (20, 1085258), (40, 542629), (431, 50360), (862, 25180), (1259, 17240), (1724, 12590), (2155, 10072), (2518, 8620), (3448, 6295), (4310, 5036)]