21187125

素因数分解:

$3^2\times 5^3\times {\mathrm{37}}^1\times {\mathrm{509}}^1$

素因数の和:567

約数の個数: 48

約数和(自身を含む): 39302640

約数和(自身を除く): 18115515

約数列:

[1, 3, 5, 9, 15, 25, 37, 45, 75, 111, 125, 185, 225, 333, 375, 509, 555, 925, 1125, 1527, 1665, 2545, 2775, 4581, 4625, 7635, 8325, 12725, 13875, 18833, 22905, 38175, 41625, 56499, 63625, 94165, 114525, 169497, 190875, 282495, 470825, 572625, 847485, 1412475, 2354125, 4237425, 7062375, 21187125]

約数ペア:

[(1, 21187125), (3, 7062375), (5, 4237425), (9, 2354125), (15, 1412475), (25, 847485), (37, 572625), (45, 470825), (75, 282495), (111, 190875), (125, 169497), (185, 114525), (225, 94165), (333, 63625), (375, 56499), (509, 41625), (555, 38175), (925, 22905), (1125, 18833), (1527, 13875), (1665, 12725), (2545, 8325), (2775, 7635), (4581, 4625)]