20640490

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{179}}^1\times {\mathrm{887}}^1$

素因数の和:1086

約数の個数: 32

約数和(自身を含む): 40279680

約数和(自身を除く): 19639190

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 179, 358, 887, 895, 1774, 1790, 2327, 4435, 4654, 8870, 11531, 11635, 23062, 23270, 57655, 115310, 158773, 317546, 793865, 1587730, 2064049, 4128098, 10320245, 20640490]

約数ペア:

[(1, 20640490), (2, 10320245), (5, 4128098), (10, 2064049), (13, 1587730), (26, 793865), (65, 317546), (130, 158773), (179, 115310), (358, 57655), (887, 23270), (895, 23062), (1774, 11635), (1790, 11531), (2327, 8870), (4435, 4654)]