21491984

素因数分解:

$2^4\times {\mathrm{71}}^1\times {\mathrm{18919}}^1$

素因数の和:18998

約数の個数: 20

約数和(自身を含む): 42229440

約数和(自身を除く): 20737456

約数列:

[1, 2, 4, 8, 16, 71, 142, 284, 568, 1136, 18919, 37838, 75676, 151352, 302704, 1343249, 2686498, 5372996, 10745992, 21491984]

約数ペア:

[(1, 21491984), (2, 10745992), (4, 5372996), (8, 2686498), (16, 1343249), (71, 302704), (142, 151352), (284, 75676), (568, 37838), (1136, 18919)]