21087880

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^2\times {\mathrm{4357}}^1$

素因数の和:4390

約数の個数: 48

約数和(自身を含む): 52165260

約数和(自身を除く): 31077380

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 121, 220, 242, 440, 484, 605, 968, 1210, 2420, 4357, 4840, 8714, 17428, 21785, 34856, 43570, 47927, 87140, 95854, 174280, 191708, 239635, 383416, 479270, 527197, 958540, 1054394, 1917080, 2108788, 2635985, 4217576, 5271970, 10543940, 21087880]

約数ペア:

[(1, 21087880), (2, 10543940), (4, 5271970), (5, 4217576), (8, 2635985), (10, 2108788), (11, 1917080), (20, 1054394), (22, 958540), (40, 527197), (44, 479270), (55, 383416), (88, 239635), (110, 191708), (121, 174280), (220, 95854), (242, 87140), (440, 47927), (484, 43570), (605, 34856), (968, 21785), (1210, 17428), (2420, 8714), (4357, 4840)]