20856875

素因数分解:

$5^4\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{151}}^1$

素因数の和:201

約数の個数: 40

約数和(自身を含む): 29915424

約数和(自身を除く): 9058549

約数列:

[1, 5, 13, 17, 25, 65, 85, 125, 151, 221, 325, 425, 625, 755, 1105, 1625, 1963, 2125, 2567, 3775, 5525, 8125, 9815, 10625, 12835, 18875, 27625, 33371, 49075, 64175, 94375, 138125, 166855, 245375, 320875, 834275, 1226875, 1604375, 4171375, 20856875]

約数ペア:

[(1, 20856875), (5, 4171375), (13, 1604375), (17, 1226875), (25, 834275), (65, 320875), (85, 245375), (125, 166855), (151, 138125), (221, 94375), (325, 64175), (425, 49075), (625, 33371), (755, 27625), (1105, 18875), (1625, 12835), (1963, 10625), (2125, 9815), (2567, 8125), (3775, 5525)]