21391251

素因数分解:

$3^1\times 7^1\times {\mathrm{47}}^1\times {\mathrm{21673}}^1$

素因数の和:21730

約数の個数: 16

約数和(自身を含む): 33291264

約数和(自身を除く): 11900013

約数列:

[1, 3, 7, 21, 47, 141, 329, 987, 21673, 65019, 151711, 455133, 1018631, 3055893, 7130417, 21391251]

約数ペア:

[(1, 21391251), (3, 7130417), (7, 3055893), (21, 1018631), (47, 455133), (141, 151711), (329, 65019), (987, 21673)]