20991880

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{79}}^1$

素因数の和:183

約数の個数: 128

約数和(自身を含む): 59673600

約数和(自身を除く): 38681720

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 20, 26, 28, 35, 40, 52, 56, 65, 70, 73, 79, 91, 104, 130, 140, 146, 158, 182, 260, 280, 292, 316, 364, 365, 395, 455, 511, 520, 553, 584, 632, 728, 730, 790, 910, 949, 1022, 1027, 1106, 1460, 1580, 1820, 1898, 2044, 2054, 2212, 2555, 2765, 2920, 3160, 3640, 3796, 4088, 4108, 4424, 4745, 5110, 5135, 5530, 5767, 6643, 7189, 7592, 8216, 9490, 10220, 10270, 11060, 11534, 13286, 14378, 18980, 20440, 20540, 22120, 23068, 26572, 28756, 28835, 33215, 35945, 37960, 40369, 41080, 46136, 53144, 57512, 57670, 66430, 71890, 74971, 80738, 115340, 132860, 143780, 149942, 161476, 201845, 230680, 265720, 287560, 299884, 322952, 374855, 403690, 524797, 599768, 749710, 807380, 1049594, 1499420, 1614760, 2099188, 2623985, 2998840, 4198376, 5247970, 10495940, 20991880]

約数ペア:

[(1, 20991880), (2, 10495940), (4, 5247970), (5, 4198376), (7, 2998840), (8, 2623985), (10, 2099188), (13, 1614760), (14, 1499420), (20, 1049594), (26, 807380), (28, 749710), (35, 599768), (40, 524797), (52, 403690), (56, 374855), (65, 322952), (70, 299884), (73, 287560), (79, 265720), (91, 230680), (104, 201845), (130, 161476), (140, 149942), (146, 143780), (158, 132860), (182, 115340), (260, 80738), (280, 74971), (292, 71890), (316, 66430), (364, 57670), (365, 57512), (395, 53144), (455, 46136), (511, 41080), (520, 40369), (553, 37960), (584, 35945), (632, 33215), (728, 28835), (730, 28756), (790, 26572), (910, 23068), (949, 22120), (1022, 20540), (1027, 20440), (1106, 18980), (1460, 14378), (1580, 13286), (1820, 11534), (1898, 11060), (2044, 10270), (2054, 10220), (2212, 9490), (2555, 8216), (2765, 7592), (2920, 7189), (3160, 6643), (3640, 5767), (3796, 5530), (4088, 5135), (4108, 5110), (4424, 4745)]