21888880

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^2\times {\mathrm{1619}}^1$

素因数の和:1658

約数の個数: 60

約数和(自身を含む): 55141560

約数和(自身を除く): 33252680

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 169, 208, 260, 338, 520, 676, 845, 1040, 1352, 1619, 1690, 2704, 3238, 3380, 6476, 6760, 8095, 12952, 13520, 16190, 21047, 25904, 32380, 42094, 64760, 84188, 105235, 129520, 168376, 210470, 273611, 336752, 420940, 547222, 841880, 1094444, 1368055, 1683760, 2188888, 2736110, 4377776, 5472220, 10944440, 21888880]

約数ペア:

[(1, 21888880), (2, 10944440), (4, 5472220), (5, 4377776), (8, 2736110), (10, 2188888), (13, 1683760), (16, 1368055), (20, 1094444), (26, 841880), (40, 547222), (52, 420940), (65, 336752), (80, 273611), (104, 210470), (130, 168376), (169, 129520), (208, 105235), (260, 84188), (338, 64760), (520, 42094), (676, 32380), (845, 25904), (1040, 21047), (1352, 16190), (1619, 13520), (1690, 12952), (2704, 8095), (3238, 6760), (3380, 6476)]