19721989

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{53}}^2\times {\mathrm{59}}^1$

素因数の和:189

約数の個数: 24

約数和(自身を含む): 24736320

約数和(自身を除く): 5014331

約数列:

[1, 7, 17, 53, 59, 119, 371, 413, 901, 1003, 2809, 3127, 6307, 7021, 19663, 21889, 47753, 53159, 165731, 334271, 372113, 1160117, 2817427, 19721989]

約数ペア:

[(1, 19721989), (7, 2817427), (17, 1160117), (53, 372113), (59, 334271), (119, 165731), (371, 53159), (413, 47753), (901, 21889), (1003, 19663), (2809, 7021), (3127, 6307)]