21628880

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{2971}}^1$

素因数の和:3004

約数の個数: 80

約数和(自身を含む): 61912704

約数和(自身を除く): 40283824

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 20, 26, 28, 35, 40, 52, 56, 65, 70, 80, 91, 104, 112, 130, 140, 182, 208, 260, 280, 364, 455, 520, 560, 728, 910, 1040, 1456, 1820, 2971, 3640, 5942, 7280, 11884, 14855, 20797, 23768, 29710, 38623, 41594, 47536, 59420, 77246, 83188, 103985, 118840, 154492, 166376, 193115, 207970, 237680, 270361, 308984, 332752, 386230, 415940, 540722, 617968, 772460, 831880, 1081444, 1351805, 1544920, 1663760, 2162888, 2703610, 3089840, 4325776, 5407220, 10814440, 21628880]

約数ペア:

[(1, 21628880), (2, 10814440), (4, 5407220), (5, 4325776), (7, 3089840), (8, 2703610), (10, 2162888), (13, 1663760), (14, 1544920), (16, 1351805), (20, 1081444), (26, 831880), (28, 772460), (35, 617968), (40, 540722), (52, 415940), (56, 386230), (65, 332752), (70, 308984), (80, 270361), (91, 237680), (104, 207970), (112, 193115), (130, 166376), (140, 154492), (182, 118840), (208, 103985), (260, 83188), (280, 77246), (364, 59420), (455, 47536), (520, 41594), (560, 38623), (728, 29710), (910, 23768), (1040, 20797), (1456, 14855), (1820, 11884), (2971, 7280), (3640, 5942)]