21205891

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{1237}}^1$

素因数の和:1354

約数の個数: 16

約数和(自身を含む): 25354240

約数和(自身を除く): 4148349

約数列:

[1, 7, 31, 79, 217, 553, 1237, 2449, 8659, 17143, 38347, 97723, 268429, 684061, 3029413, 21205891]

約数ペア:

[(1, 21205891), (7, 3029413), (31, 684061), (79, 268429), (217, 97723), (553, 38347), (1237, 17143), (2449, 8659)]