20291440

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{179}}^1$

素因数の和:314

約数の個数: 80

約数和(自身を含む): 51559200

約数和(自身を除く): 31267760

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 109, 130, 179, 208, 218, 260, 358, 436, 520, 545, 716, 872, 895, 1040, 1090, 1417, 1432, 1744, 1790, 2180, 2327, 2834, 2864, 3580, 4360, 4654, 5668, 7085, 7160, 8720, 9308, 11336, 11635, 14170, 14320, 18616, 19511, 22672, 23270, 28340, 37232, 39022, 46540, 56680, 78044, 93080, 97555, 113360, 156088, 186160, 195110, 253643, 312176, 390220, 507286, 780440, 1014572, 1268215, 1560880, 2029144, 2536430, 4058288, 5072860, 10145720, 20291440]

約数ペア:

[(1, 20291440), (2, 10145720), (4, 5072860), (5, 4058288), (8, 2536430), (10, 2029144), (13, 1560880), (16, 1268215), (20, 1014572), (26, 780440), (40, 507286), (52, 390220), (65, 312176), (80, 253643), (104, 195110), (109, 186160), (130, 156088), (179, 113360), (208, 97555), (218, 93080), (260, 78044), (358, 56680), (436, 46540), (520, 39022), (545, 37232), (716, 28340), (872, 23270), (895, 22672), (1040, 19511), (1090, 18616), (1417, 14320), (1432, 14170), (1744, 11635), (1790, 11336), (2180, 9308), (2327, 8720), (2834, 7160), (2864, 7085), (3580, 5668), (4360, 4654)]