21721725

素因数分解:

$3^2\times 5^2\times {\mathrm{29}}^1\times {\mathrm{3329}}^1$

素因数の和:3374

約数の個数: 36

約数和(自身を含む): 40259700

約数和(自身を除く): 18537975

約数列:

[1, 3, 5, 9, 15, 25, 29, 45, 75, 87, 145, 225, 261, 435, 725, 1305, 2175, 3329, 6525, 9987, 16645, 29961, 49935, 83225, 96541, 149805, 249675, 289623, 482705, 749025, 868869, 1448115, 2413525, 4344345, 7240575, 21721725]

約数ペア:

[(1, 21721725), (3, 7240575), (5, 4344345), (9, 2413525), (15, 1448115), (25, 868869), (29, 749025), (45, 482705), (75, 289623), (87, 249675), (145, 149805), (225, 96541), (261, 83225), (435, 49935), (725, 29961), (1305, 16645), (2175, 9987), (3329, 6525)]