21216760

素因数分解:

$2^3\times 5^1\times {\mathrm{131}}^1\times {\mathrm{4049}}^1$

素因数の和:4191

約数の個数: 32

約数和(自身を含む): 48114000

約数和(自身を除く): 26897240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 131, 262, 524, 655, 1048, 1310, 2620, 4049, 5240, 8098, 16196, 20245, 32392, 40490, 80980, 161960, 530419, 1060838, 2121676, 2652095, 4243352, 5304190, 10608380, 21216760]

約数ペア:

[(1, 21216760), (2, 10608380), (4, 5304190), (5, 4243352), (8, 2652095), (10, 2121676), (20, 1060838), (40, 530419), (131, 161960), (262, 80980), (524, 40490), (655, 32392), (1048, 20245), (1310, 16196), (2620, 8098), (4049, 5240)]