21278005

素因数分解:

$5^1\times 7^3\times {\mathrm{19}}^1\times {\mathrm{653}}^1$

素因数の和:698

約数の個数: 32

約数和(自身を含む): 31392000

約数和(自身を除く): 10113995

約数列:

[1, 5, 7, 19, 35, 49, 95, 133, 245, 343, 653, 665, 931, 1715, 3265, 4571, 4655, 6517, 12407, 22855, 31997, 32585, 62035, 86849, 159985, 223979, 434245, 607943, 1119895, 3039715, 4255601, 21278005]

約数ペア:

[(1, 21278005), (5, 4255601), (7, 3039715), (19, 1119895), (35, 607943), (49, 434245), (95, 223979), (133, 159985), (245, 86849), (343, 62035), (653, 32585), (665, 31997), (931, 22855), (1715, 12407), (3265, 6517), (4571, 4655)]