21187960

素因数分解:

$2^3\times 5^1\times {\mathrm{431}}^1\times {\mathrm{1229}}^1$

素因数の和:1671

約数の個数: 32

約数和(自身を含む): 47822400

約数和(自身を除く): 26634440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 431, 862, 1229, 1724, 2155, 2458, 3448, 4310, 4916, 6145, 8620, 9832, 12290, 17240, 24580, 49160, 529699, 1059398, 2118796, 2648495, 4237592, 5296990, 10593980, 21187960]

約数ペア:

[(1, 21187960), (2, 10593980), (4, 5296990), (5, 4237592), (8, 2648495), (10, 2118796), (20, 1059398), (40, 529699), (431, 49160), (862, 24580), (1229, 17240), (1724, 12290), (2155, 9832), (2458, 8620), (3448, 6145), (4310, 4916)]