21105880

素因数分解:

$2^3\times 5^1\times {\mathrm{503}}^1\times {\mathrm{1049}}^1$

素因数の和:1563

約数の個数: 32

約数和(自身を含む): 47628000

約数和(自身を除く): 26522120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 503, 1006, 1049, 2012, 2098, 2515, 4024, 4196, 5030, 5245, 8392, 10060, 10490, 20120, 20980, 41960, 527647, 1055294, 2110588, 2638235, 4221176, 5276470, 10552940, 21105880]

約数ペア:

[(1, 21105880), (2, 10552940), (4, 5276470), (5, 4221176), (8, 2638235), (10, 2110588), (20, 1055294), (40, 527647), (503, 41960), (1006, 20980), (1049, 20120), (2012, 10490), (2098, 10060), (2515, 8392), (4024, 5245), (4196, 5030)]