20513620

素因数分解:

$2^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{139}}^1\times {\mathrm{157}}^1$

素因数の和:352

約数の個数: 48

約数和(自身を含む): 44593920

約数和(自身を除く): 24080300

約数列:

[1, 2, 4, 5, 10, 20, 47, 94, 139, 157, 188, 235, 278, 314, 470, 556, 628, 695, 785, 940, 1390, 1570, 2780, 3140, 6533, 7379, 13066, 14758, 21823, 26132, 29516, 32665, 36895, 43646, 65330, 73790, 87292, 109115, 130660, 147580, 218230, 436460, 1025681, 2051362, 4102724, 5128405, 10256810, 20513620]

約数ペア:

[(1, 20513620), (2, 10256810), (4, 5128405), (5, 4102724), (10, 2051362), (20, 1025681), (47, 436460), (94, 218230), (139, 147580), (157, 130660), (188, 109115), (235, 87292), (278, 73790), (314, 65330), (470, 43646), (556, 36895), (628, 32665), (695, 29516), (785, 26132), (940, 21823), (1390, 14758), (1570, 13066), (2780, 7379), (3140, 6533)]