21195800

素因数分解:

$2^3\times 5^2\times {\mathrm{131}}^1\times {\mathrm{809}}^1$

素因数の和:956

約数の個数: 48

約数和(自身を含む): 49717800

約数和(自身を除く): 28522000

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 131, 200, 262, 524, 655, 809, 1048, 1310, 1618, 2620, 3236, 3275, 4045, 5240, 6472, 6550, 8090, 13100, 16180, 20225, 26200, 32360, 40450, 80900, 105979, 161800, 211958, 423916, 529895, 847832, 1059790, 2119580, 2649475, 4239160, 5298950, 10597900, 21195800]

約数ペア:

[(1, 21195800), (2, 10597900), (4, 5298950), (5, 4239160), (8, 2649475), (10, 2119580), (20, 1059790), (25, 847832), (40, 529895), (50, 423916), (100, 211958), (131, 161800), (200, 105979), (262, 80900), (524, 40450), (655, 32360), (809, 26200), (1048, 20225), (1310, 16180), (1618, 13100), (2620, 8090), (3236, 6550), (3275, 6472), (4045, 5240)]