21550880

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^2\times {\mathrm{797}}^1$

素因数の和:838

約数の個数: 72

約数和(自身を含む): 55200852

約数和(自身を除く): 33649972

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 80, 104, 130, 160, 169, 208, 260, 338, 416, 520, 676, 797, 845, 1040, 1352, 1594, 1690, 2080, 2704, 3188, 3380, 3985, 5408, 6376, 6760, 7970, 10361, 12752, 13520, 15940, 20722, 25504, 27040, 31880, 41444, 51805, 63760, 82888, 103610, 127520, 134693, 165776, 207220, 269386, 331552, 414440, 538772, 673465, 828880, 1077544, 1346930, 1657760, 2155088, 2693860, 4310176, 5387720, 10775440, 21550880]

約数ペア:

[(1, 21550880), (2, 10775440), (4, 5387720), (5, 4310176), (8, 2693860), (10, 2155088), (13, 1657760), (16, 1346930), (20, 1077544), (26, 828880), (32, 673465), (40, 538772), (52, 414440), (65, 331552), (80, 269386), (104, 207220), (130, 165776), (160, 134693), (169, 127520), (208, 103610), (260, 82888), (338, 63760), (416, 51805), (520, 41444), (676, 31880), (797, 27040), (845, 25504), (1040, 20722), (1352, 15940), (1594, 13520), (1690, 12752), (2080, 10361), (2704, 7970), (3188, 6760), (3380, 6376), (3985, 5408)]