21390640

素因数分解:

$2^4\times 5^1\times {\mathrm{47}}^1\times {\mathrm{5689}}^1$

素因数の和:5749

約数の個数: 40

約数和(自身を含む): 50800320

約数和(自身を除く): 29409680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 47, 80, 94, 188, 235, 376, 470, 752, 940, 1880, 3760, 5689, 11378, 22756, 28445, 45512, 56890, 91024, 113780, 227560, 267383, 455120, 534766, 1069532, 1336915, 2139064, 2673830, 4278128, 5347660, 10695320, 21390640]

約数ペア:

[(1, 21390640), (2, 10695320), (4, 5347660), (5, 4278128), (8, 2673830), (10, 2139064), (16, 1336915), (20, 1069532), (40, 534766), (47, 455120), (80, 267383), (94, 227560), (188, 113780), (235, 91024), (376, 56890), (470, 45512), (752, 28445), (940, 22756), (1880, 11378), (3760, 5689)]