20304580

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{79}}^1\times {\mathrm{181}}^1$

素因数の和:340

約数の個数: 48

約数和(自身を含む): 44029440

約数和(自身を除く): 23724860

約数列:

[1, 2, 4, 5, 10, 20, 71, 79, 142, 158, 181, 284, 316, 355, 362, 395, 710, 724, 790, 905, 1420, 1580, 1810, 3620, 5609, 11218, 12851, 14299, 22436, 25702, 28045, 28598, 51404, 56090, 57196, 64255, 71495, 112180, 128510, 142990, 257020, 285980, 1015229, 2030458, 4060916, 5076145, 10152290, 20304580]

約数ペア:

[(1, 20304580), (2, 10152290), (4, 5076145), (5, 4060916), (10, 2030458), (20, 1015229), (71, 285980), (79, 257020), (142, 142990), (158, 128510), (181, 112180), (284, 71495), (316, 64255), (355, 57196), (362, 56090), (395, 51404), (710, 28598), (724, 28045), (790, 25702), (905, 22436), (1420, 14299), (1580, 12851), (1810, 11218), (3620, 5609)]