20966920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{661}}^1$

素因数の和:746

約数の個数: 64

約数和(自身を含む): 51715440

約数和(自身を除く): 30748520

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 61, 65, 104, 122, 130, 244, 260, 305, 488, 520, 610, 661, 793, 1220, 1322, 1586, 2440, 2644, 3172, 3305, 3965, 5288, 6344, 6610, 7930, 8593, 13220, 15860, 17186, 26440, 31720, 34372, 40321, 42965, 68744, 80642, 85930, 161284, 171860, 201605, 322568, 343720, 403210, 524173, 806420, 1048346, 1612840, 2096692, 2620865, 4193384, 5241730, 10483460, 20966920]

約数ペア:

[(1, 20966920), (2, 10483460), (4, 5241730), (5, 4193384), (8, 2620865), (10, 2096692), (13, 1612840), (20, 1048346), (26, 806420), (40, 524173), (52, 403210), (61, 343720), (65, 322568), (104, 201605), (122, 171860), (130, 161284), (244, 85930), (260, 80642), (305, 68744), (488, 42965), (520, 40321), (610, 34372), (661, 31720), (793, 26440), (1220, 17186), (1322, 15860), (1586, 13220), (2440, 8593), (2644, 7930), (3172, 6610), (3305, 6344), (3965, 5288)]