21721959

素因数分解:

$3^3\times 7^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{263}}^1$

素因数の和:321

約数の個数: 64

約数和(自身を含む): 40550400

約数和(自身を除く): 18828441

約数列:

[1, 3, 7, 9, 19, 21, 23, 27, 57, 63, 69, 133, 161, 171, 189, 207, 263, 399, 437, 483, 513, 621, 789, 1197, 1311, 1449, 1841, 2367, 3059, 3591, 3933, 4347, 4997, 5523, 6049, 7101, 9177, 11799, 14991, 16569, 18147, 27531, 34979, 42343, 44973, 49707, 54441, 82593, 104937, 114931, 127029, 134919, 163323, 314811, 344793, 381087, 804517, 944433, 1034379, 1143261, 2413551, 3103137, 7240653, 21721959]

約数ペア:

[(1, 21721959), (3, 7240653), (7, 3103137), (9, 2413551), (19, 1143261), (21, 1034379), (23, 944433), (27, 804517), (57, 381087), (63, 344793), (69, 314811), (133, 163323), (161, 134919), (171, 127029), (189, 114931), (207, 104937), (263, 82593), (399, 54441), (437, 49707), (483, 44973), (513, 42343), (621, 34979), (789, 27531), (1197, 18147), (1311, 16569), (1449, 14991), (1841, 11799), (2367, 9177), (3059, 7101), (3591, 6049), (3933, 5523), (4347, 4997)]