21316840

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{17191}}^1$

素因数の和:17233

約数の個数: 32

約数和(自身を含む): 49512960

約数和(自身を除く): 28196120

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 17191, 34382, 68764, 85955, 137528, 171910, 343820, 532921, 687640, 1065842, 2131684, 2664605, 4263368, 5329210, 10658420, 21316840]

約数ペア:

[(1, 21316840), (2, 10658420), (4, 5329210), (5, 4263368), (8, 2664605), (10, 2131684), (20, 1065842), (31, 687640), (40, 532921), (62, 343820), (124, 171910), (155, 137528), (248, 85955), (310, 68764), (620, 34382), (1240, 17191)]