21280345

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{89}}^1\times {\mathrm{97}}^1$

素因数の和:237

約数の個数: 32

約数和(自身を含む): 28576800

約数和(自身を除く): 7296455

約数列:

[1, 5, 17, 29, 85, 89, 97, 145, 445, 485, 493, 1513, 1649, 2465, 2581, 2813, 7565, 8245, 8633, 12905, 14065, 43165, 43877, 47821, 146761, 219385, 239105, 250357, 733805, 1251785, 4256069, 21280345]

約数ペア:

[(1, 21280345), (5, 4256069), (17, 1251785), (29, 733805), (85, 250357), (89, 239105), (97, 219385), (145, 146761), (445, 47821), (485, 43877), (493, 43165), (1513, 14065), (1649, 12905), (2465, 8633), (2581, 8245), (2813, 7565)]