17978890

素因数分解:

$2^1\times 5^1\times {\mathrm{89}}^1\times {\mathrm{20201}}^1$

素因数の和:20297

約数の個数: 16

約数和(自身を含む): 32727240

約数和(自身を除く): 14748350

約数列:

[1, 2, 5, 10, 89, 178, 445, 890, 20201, 40402, 101005, 202010, 1797889, 3595778, 8989445, 17978890]

約数ペア:

[(1, 17978890), (2, 8989445), (5, 3595778), (10, 1797889), (89, 202010), (178, 101005), (445, 40402), (890, 20201)]