21397875

素因数分解:

$3^1\times 5^3\times {\mathrm{43}}^1\times {\mathrm{1327}}^1$

素因数の和:1388

約数の個数: 32

約数和(自身を含む): 36461568

約数和(自身を除く): 15063693

約数列:

[1, 3, 5, 15, 25, 43, 75, 125, 129, 215, 375, 645, 1075, 1327, 3225, 3981, 5375, 6635, 16125, 19905, 33175, 57061, 99525, 165875, 171183, 285305, 497625, 855915, 1426525, 4279575, 7132625, 21397875]

約数ペア:

[(1, 21397875), (3, 7132625), (5, 4279575), (15, 1426525), (25, 855915), (43, 497625), (75, 285305), (125, 171183), (129, 165875), (215, 99525), (375, 57061), (645, 33175), (1075, 19905), (1327, 16125), (3225, 6635), (3981, 5375)]