20689431

素因数分解:

$3^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{521}}^1$

素因数の和:623

約数の個数: 32

約数和(自身を含む): 33140736

約数和(自身を除く): 12451305

約数列:

[1, 3, 7, 21, 31, 61, 93, 183, 217, 427, 521, 651, 1281, 1563, 1891, 3647, 5673, 10941, 13237, 16151, 31781, 39711, 48453, 95343, 113057, 222467, 339171, 667401, 985211, 2955633, 6896477, 20689431]

約数ペア:

[(1, 20689431), (3, 6896477), (7, 2955633), (21, 985211), (31, 667401), (61, 339171), (93, 222467), (183, 113057), (217, 95343), (427, 48453), (521, 39711), (651, 31781), (1281, 16151), (1563, 13237), (1891, 10941), (3647, 5673)]