21320520

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{173}}^1$

素因数の和:279

約数の個数: 128

約数和(自身を含む): 70156800

約数和(自身を除く): 48836280

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 20, 24, 26, 30, 39, 40, 52, 60, 65, 78, 79, 104, 120, 130, 156, 158, 173, 195, 237, 260, 312, 316, 346, 390, 395, 474, 519, 520, 632, 692, 780, 790, 865, 948, 1027, 1038, 1185, 1384, 1560, 1580, 1730, 1896, 2054, 2076, 2249, 2370, 2595, 3081, 3160, 3460, 4108, 4152, 4498, 4740, 5135, 5190, 6162, 6747, 6920, 8216, 8996, 9480, 10270, 10380, 11245, 12324, 13494, 13667, 15405, 17992, 20540, 20760, 22490, 24648, 26988, 27334, 30810, 33735, 41001, 41080, 44980, 53976, 54668, 61620, 67470, 68335, 82002, 89960, 109336, 123240, 134940, 136670, 164004, 177671, 205005, 269880, 273340, 328008, 355342, 410010, 533013, 546680, 710684, 820020, 888355, 1066026, 1421368, 1640040, 1776710, 2132052, 2665065, 3553420, 4264104, 5330130, 7106840, 10660260, 21320520]

約数ペア:

[(1, 21320520), (2, 10660260), (3, 7106840), (4, 5330130), (5, 4264104), (6, 3553420), (8, 2665065), (10, 2132052), (12, 1776710), (13, 1640040), (15, 1421368), (20, 1066026), (24, 888355), (26, 820020), (30, 710684), (39, 546680), (40, 533013), (52, 410010), (60, 355342), (65, 328008), (78, 273340), (79, 269880), (104, 205005), (120, 177671), (130, 164004), (156, 136670), (158, 134940), (173, 123240), (195, 109336), (237, 89960), (260, 82002), (312, 68335), (316, 67470), (346, 61620), (390, 54668), (395, 53976), (474, 44980), (519, 41080), (520, 41001), (632, 33735), (692, 30810), (780, 27334), (790, 26988), (865, 24648), (948, 22490), (1027, 20760), (1038, 20540), (1185, 17992), (1384, 15405), (1560, 13667), (1580, 13494), (1730, 12324), (1896, 11245), (2054, 10380), (2076, 10270), (2249, 9480), (2370, 8996), (2595, 8216), (3081, 6920), (3160, 6747), (3460, 6162), (4108, 5190), (4152, 5135), (4498, 4740)]