20912020

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^2\times {\mathrm{281}}^1$

素因数の和:412

約数の個数: 36

約数和(自身を含む): 44805852

約数和(自身を除く): 23893832

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 281, 305, 562, 610, 1124, 1220, 1405, 2810, 3721, 5620, 7442, 14884, 17141, 18605, 34282, 37210, 68564, 74420, 85705, 171410, 342820, 1045601, 2091202, 4182404, 5228005, 10456010, 20912020]

約数ペア:

[(1, 20912020), (2, 10456010), (4, 5228005), (5, 4182404), (10, 2091202), (20, 1045601), (61, 342820), (122, 171410), (244, 85705), (281, 74420), (305, 68564), (562, 37210), (610, 34282), (1124, 18605), (1220, 17141), (1405, 14884), (2810, 7442), (3721, 5620)]