21891665

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{83}}^1\times {\mathrm{107}}^1$

素因数の和:241

約数の個数: 32

約数和(自身を含む): 29393280

約数和(自身を除く): 7501615

約数列:

[1, 5, 17, 29, 83, 85, 107, 145, 415, 493, 535, 1411, 1819, 2407, 2465, 3103, 7055, 8881, 9095, 12035, 15515, 40919, 44405, 52751, 150977, 204595, 257549, 263755, 754885, 1287745, 4378333, 21891665]

約数ペア:

[(1, 21891665), (5, 4378333), (17, 1287745), (29, 754885), (83, 263755), (85, 257549), (107, 204595), (145, 150977), (415, 52751), (493, 44405), (535, 40919), (1411, 15515), (1819, 12035), (2407, 9095), (2465, 8881), (3103, 7055)]