81299920

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78173}}^1$

素因数の和:78199

約数の個数: 40

約数和(自身を含む): 203565096

約数和(自身を除く): 122265176

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 78173, 156346, 312692, 390865, 625384, 781730, 1016249, 1250768, 1563460, 2032498, 3126920, 4064996, 5081245, 6253840, 8129992, 10162490, 16259984, 20324980, 40649960, 81299920]

約数ペア:

[(1, 81299920), (2, 40649960), (4, 20324980), (5, 16259984), (8, 10162490), (10, 8129992), (13, 6253840), (16, 5081245), (20, 4064996), (26, 3126920), (40, 2032498), (52, 1563460), (65, 1250768), (80, 1016249), (104, 781730), (130, 625384), (208, 390865), (260, 312692), (520, 156346), (1040, 78173)]