19991920

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{409}}^1$

素因数の和:482

約数の個数: 80

約数和(自身を含む): 51246720

約数和(自身を除く): 31254800

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 47, 52, 65, 80, 94, 104, 130, 188, 208, 235, 260, 376, 409, 470, 520, 611, 752, 818, 940, 1040, 1222, 1636, 1880, 2045, 2444, 3055, 3272, 3760, 4090, 4888, 5317, 6110, 6544, 8180, 9776, 10634, 12220, 16360, 19223, 21268, 24440, 26585, 32720, 38446, 42536, 48880, 53170, 76892, 85072, 96115, 106340, 153784, 192230, 212680, 249899, 307568, 384460, 425360, 499798, 768920, 999596, 1249495, 1537840, 1999192, 2498990, 3998384, 4997980, 9995960, 19991920]

約数ペア:

[(1, 19991920), (2, 9995960), (4, 4997980), (5, 3998384), (8, 2498990), (10, 1999192), (13, 1537840), (16, 1249495), (20, 999596), (26, 768920), (40, 499798), (47, 425360), (52, 384460), (65, 307568), (80, 249899), (94, 212680), (104, 192230), (130, 153784), (188, 106340), (208, 96115), (235, 85072), (260, 76892), (376, 53170), (409, 48880), (470, 42536), (520, 38446), (611, 32720), (752, 26585), (818, 24440), (940, 21268), (1040, 19223), (1222, 16360), (1636, 12220), (1880, 10634), (2045, 9776), (2444, 8180), (3055, 6544), (3272, 6110), (3760, 5317), (4090, 4888)]