20991984

素因数分解:

$2^4\times 3^1\times {\mathrm{13}}^1\times {\mathrm{33641}}^1$

素因数の和:33665

約数の個数: 40

約数和(自身を含む): 58402512

約数和(自身を除く): 37410528

約数列:

[1, 2, 3, 4, 6, 8, 12, 13, 16, 24, 26, 39, 48, 52, 78, 104, 156, 208, 312, 624, 33641, 67282, 100923, 134564, 201846, 269128, 403692, 437333, 538256, 807384, 874666, 1311999, 1614768, 1749332, 2623998, 3498664, 5247996, 6997328, 10495992, 20991984]

約数ペア:

[(1, 20991984), (2, 10495992), (3, 6997328), (4, 5247996), (6, 3498664), (8, 2623998), (12, 1749332), (13, 1614768), (16, 1311999), (24, 874666), (26, 807384), (39, 538256), (48, 437333), (52, 403692), (78, 269128), (104, 201846), (156, 134564), (208, 100923), (312, 67282), (624, 33641)]