20981896

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{229}}^1\times {\mathrm{881}}^1$

素因数の和:1129

約数の個数: 32

約数和(自身を含む): 42600600

約数和(自身を除く): 21618704

約数列:

[1, 2, 4, 8, 13, 26, 52, 104, 229, 458, 881, 916, 1762, 1832, 2977, 3524, 5954, 7048, 11453, 11908, 22906, 23816, 45812, 91624, 201749, 403498, 806996, 1613992, 2622737, 5245474, 10490948, 20981896]

約数ペア:

[(1, 20981896), (2, 10490948), (4, 5245474), (8, 2622737), (13, 1613992), (26, 806996), (52, 403498), (104, 201749), (229, 91624), (458, 45812), (881, 23816), (916, 22906), (1762, 11908), (1832, 11453), (2977, 7048), (3524, 5954)]