20661920

素因数分解:

$2^5\times 5^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1\times {\mathrm{73}}^1$

素因数の和:178

約数の個数: 96

約数和(自身を含む): 52027920

約数和(自身を除く): 31366000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 32, 40, 58, 61, 73, 80, 116, 122, 145, 146, 160, 232, 244, 290, 292, 305, 365, 464, 488, 580, 584, 610, 730, 928, 976, 1160, 1168, 1220, 1460, 1769, 1952, 2117, 2320, 2336, 2440, 2920, 3538, 4234, 4453, 4640, 4880, 5840, 7076, 8468, 8845, 8906, 9760, 10585, 11680, 14152, 16936, 17690, 17812, 21170, 22265, 28304, 33872, 35380, 35624, 42340, 44530, 56608, 67744, 70760, 71248, 84680, 89060, 129137, 141520, 142496, 169360, 178120, 258274, 283040, 338720, 356240, 516548, 645685, 712480, 1033096, 1291370, 2066192, 2582740, 4132384, 5165480, 10330960, 20661920]

約数ペア:

[(1, 20661920), (2, 10330960), (4, 5165480), (5, 4132384), (8, 2582740), (10, 2066192), (16, 1291370), (20, 1033096), (29, 712480), (32, 645685), (40, 516548), (58, 356240), (61, 338720), (73, 283040), (80, 258274), (116, 178120), (122, 169360), (145, 142496), (146, 141520), (160, 129137), (232, 89060), (244, 84680), (290, 71248), (292, 70760), (305, 67744), (365, 56608), (464, 44530), (488, 42340), (580, 35624), (584, 35380), (610, 33872), (730, 28304), (928, 22265), (976, 21170), (1160, 17812), (1168, 17690), (1220, 16936), (1460, 14152), (1769, 11680), (1952, 10585), (2117, 9760), (2320, 8906), (2336, 8845), (2440, 8468), (2920, 7076), (3538, 5840), (4234, 4880), (4453, 4640)]