21387765

素因数分解:

$3^1\times 5^1\times 7^3\times {\mathrm{4157}}^1$

素因数の和:4186

約数の個数: 32

約数和(自身を含む): 39916800

約数和(自身を除く): 18529035

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 105, 147, 245, 343, 735, 1029, 1715, 4157, 5145, 12471, 20785, 29099, 62355, 87297, 145495, 203693, 436485, 611079, 1018465, 1425851, 3055395, 4277553, 7129255, 21387765]

約数ペア:

[(1, 21387765), (3, 7129255), (5, 4277553), (7, 3055395), (15, 1425851), (21, 1018465), (35, 611079), (49, 436485), (105, 203693), (147, 145495), (245, 87297), (343, 62355), (735, 29099), (1029, 20785), (1715, 12471), (4157, 5145)]