21858005

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{131}}^1\times {\mathrm{151}}^1$

素因数の和:317

約数の個数: 32

約数和(自身を含む): 30336768

約数和(自身を除く): 8478763

約数列:

[1, 5, 13, 17, 65, 85, 131, 151, 221, 655, 755, 1105, 1703, 1963, 2227, 2567, 8515, 9815, 11135, 12835, 19781, 28951, 33371, 98905, 144755, 166855, 257153, 336277, 1285765, 1681385, 4371601, 21858005]

約数ペア:

[(1, 21858005), (5, 4371601), (13, 1681385), (17, 1285765), (65, 336277), (85, 257153), (131, 166855), (151, 144755), (221, 98905), (655, 33371), (755, 28951), (1105, 19781), (1703, 12835), (1963, 11135), (2227, 9815), (2567, 8515)]