20782760

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^2\times {\mathrm{281}}^1$

素因数の和:378

約数の個数: 48

約数和(自身を含む): 48044340

約数和(自身を除く): 27261580

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 281, 344, 430, 562, 860, 1124, 1405, 1720, 1849, 2248, 2810, 3698, 5620, 7396, 9245, 11240, 12083, 14792, 18490, 24166, 36980, 48332, 60415, 73960, 96664, 120830, 241660, 483320, 519569, 1039138, 2078276, 2597845, 4156552, 5195690, 10391380, 20782760]

約数ペア:

[(1, 20782760), (2, 10391380), (4, 5195690), (5, 4156552), (8, 2597845), (10, 2078276), (20, 1039138), (40, 519569), (43, 483320), (86, 241660), (172, 120830), (215, 96664), (281, 73960), (344, 60415), (430, 48332), (562, 36980), (860, 24166), (1124, 18490), (1405, 14792), (1720, 12083), (1849, 11240), (2248, 9245), (2810, 7396), (3698, 5620)]