21680986

素因数分解:

$2^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1\times {\mathrm{2503}}^1$

素因数の和:2637

約数の個数: 16

約数和(自身を含む): 33533568

約数和(自身を除く): 11852582

約数列:

[1, 2, 61, 71, 122, 142, 2503, 4331, 5006, 8662, 152683, 177713, 305366, 355426, 10840493, 21680986]

約数ペア:

[(1, 21680986), (2, 10840493), (61, 355426), (71, 305366), (122, 177713), (142, 152683), (2503, 8662), (4331, 5006)]