399984

素因数分解:

$2^4\times 3^1\times {\mathrm{13}}^1\times {\mathrm{641}}^1$

素因数の和:665

約数の個数: 40

約数和(自身を含む): 1114512

約数和(自身を除く): 714528

約数列:

[1, 2, 3, 4, 6, 8, 12, 13, 16, 24, 26, 39, 48, 52, 78, 104, 156, 208, 312, 624, 641, 1282, 1923, 2564, 3846, 5128, 7692, 8333, 10256, 15384, 16666, 24999, 30768, 33332, 49998, 66664, 99996, 133328, 199992, 399984]

約数ペア:

[(1, 399984), (2, 199992), (3, 133328), (4, 99996), (6, 66664), (8, 49998), (12, 33332), (13, 30768), (16, 24999), (24, 16666), (26, 15384), (39, 10256), (48, 8333), (52, 7692), (78, 5128), (104, 3846), (156, 2564), (208, 1923), (312, 1282), (624, 641)]