21321391

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{167}}^1$

素因数の和:271

約数の個数: 32

約数和(自身を含む): 27998208

約数和(自身を除く): 6676817

約数列:

[1, 7, 13, 23, 61, 91, 161, 167, 299, 427, 793, 1169, 1403, 2093, 2171, 3841, 5551, 9821, 10187, 15197, 18239, 26887, 49933, 71309, 127673, 132431, 234301, 349531, 927017, 1640107, 3045913, 21321391]

約数ペア:

[(1, 21321391), (7, 3045913), (13, 1640107), (23, 927017), (61, 349531), (91, 234301), (161, 132431), (167, 127673), (299, 71309), (427, 49933), (793, 26887), (1169, 18239), (1403, 15197), (2093, 10187), (2171, 9821), (3841, 5551)]