21249880

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{17137}}^1$

素因数の和:17179

約数の個数: 32

約数和(自身を含む): 49357440

約数和(自身を除く): 28107560

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 17137, 34274, 68548, 85685, 137096, 171370, 342740, 531247, 685480, 1062494, 2124988, 2656235, 4249976, 5312470, 10624940, 21249880]

約数ペア:

[(1, 21249880), (2, 10624940), (4, 5312470), (5, 4249976), (8, 2656235), (10, 2124988), (20, 1062494), (31, 685480), (40, 531247), (62, 342740), (124, 171370), (155, 137096), (248, 85685), (310, 68548), (620, 34274), (1240, 17137)]