21076840

素因数分解:

$2^3\times 5^1\times {\mathrm{457}}^1\times {\mathrm{1153}}^1$

素因数の和:1621

約数の個数: 32

約数和(自身を含む): 47567880

約数和(自身を除く): 26491040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 457, 914, 1153, 1828, 2285, 2306, 3656, 4570, 4612, 5765, 9140, 9224, 11530, 18280, 23060, 46120, 526921, 1053842, 2107684, 2634605, 4215368, 5269210, 10538420, 21076840]

約数ペア:

[(1, 21076840), (2, 10538420), (4, 5269210), (5, 4215368), (8, 2634605), (10, 2107684), (20, 1053842), (40, 526921), (457, 46120), (914, 23060), (1153, 18280), (1828, 11530), (2285, 9224), (2306, 9140), (3656, 5765), (4570, 4612)]