21397640

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^2\times {\mathrm{4421}}^1$

素因数の和:4454

約数の個数: 48

約数和(自身を含む): 52931340

約数和(自身を除く): 31533700

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, 4421, 4840, 8842, 17684, 22105, 35368, 44210, 48631, 88420, 97262, 176840, 194524, 243155, 389048, 486310, 534941, 972620, 1069882, 1945240, 2139764, 2674705, 4279528, 5349410, 10698820, 21397640]

約数ペア:

[(1, 21397640), (2, 10698820), (4, 5349410), (5, 4279528), (8, 2674705), (10, 2139764), (11, 1945240), (20, 1069882), (22, 972620), (40, 534941), (44, 486310), (55, 389048), (88, 243155), (110, 194524), (121, 176840), (220, 97262), (242, 88420), (440, 48631), (484, 44210), (605, 35368), (968, 22105), (1210, 17684), (2420, 8842), (4421, 4840)]