21076875

素因数分解:

$3^3\times 5^4\times {\mathrm{1249}}^1$

素因数の和:1278

約数の個数: 40

約数和(自身を含む): 39050000

約数和(自身を除く): 17973125

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 75, 125, 135, 225, 375, 625, 675, 1125, 1249, 1875, 3375, 3747, 5625, 6245, 11241, 16875, 18735, 31225, 33723, 56205, 93675, 156125, 168615, 281025, 468375, 780625, 843075, 1405125, 2341875, 4215375, 7025625, 21076875]

約数ペア:

[(1, 21076875), (3, 7025625), (5, 4215375), (9, 2341875), (15, 1405125), (25, 843075), (27, 780625), (45, 468375), (75, 281025), (125, 168615), (135, 156125), (225, 93675), (375, 56205), (625, 33723), (675, 31225), (1125, 18735), (1249, 16875), (1875, 11241), (3375, 6245), (3747, 5625)]