21237671

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{73}}^1\times {\mathrm{139}}^1$

素因数の和:255

約数の個数: 32

約数和(自身を含む): 27847680

約数和(自身を除く): 6610009

約数列:

[1, 7, 13, 23, 73, 91, 139, 161, 299, 511, 949, 973, 1679, 1807, 2093, 3197, 6643, 10147, 11753, 12649, 21827, 22379, 41561, 71029, 131911, 152789, 233381, 290927, 923377, 1633667, 3033953, 21237671]

約数ペア:

[(1, 21237671), (7, 3033953), (13, 1633667), (23, 923377), (73, 290927), (91, 233381), (139, 152789), (161, 131911), (299, 71029), (511, 41561), (949, 22379), (973, 21827), (1679, 12649), (1807, 11753), (2093, 10147), (3197, 6643)]