21406240

素因数分解:

$2^5\times 5^1\times {\mathrm{337}}^1\times {\mathrm{397}}^1$

素因数の和:749

約数の個数: 48

約数和(自身を含む): 50850072

約数和(自身を除く): 29443832

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 337, 397, 674, 794, 1348, 1588, 1685, 1985, 2696, 3176, 3370, 3970, 5392, 6352, 6740, 7940, 10784, 12704, 13480, 15880, 26960, 31760, 53920, 63520, 133789, 267578, 535156, 668945, 1070312, 1337890, 2140624, 2675780, 4281248, 5351560, 10703120, 21406240]

約数ペア:

[(1, 21406240), (2, 10703120), (4, 5351560), (5, 4281248), (8, 2675780), (10, 2140624), (16, 1337890), (20, 1070312), (32, 668945), (40, 535156), (80, 267578), (160, 133789), (337, 63520), (397, 53920), (674, 31760), (794, 26960), (1348, 15880), (1588, 13480), (1685, 12704), (1985, 10784), (2696, 7940), (3176, 6740), (3370, 6352), (3970, 5392)]