21018123

素因数分解:

$3^4\times 7^1\times {\mathrm{19}}^1\times {\mathrm{1951}}^1$

素因数の和:1989

約数の個数: 40

約数和(自身を含む): 37790720

約数和(自身を除く): 16772597

約数列:

[1, 3, 7, 9, 19, 21, 27, 57, 63, 81, 133, 171, 189, 399, 513, 567, 1197, 1539, 1951, 3591, 5853, 10773, 13657, 17559, 37069, 40971, 52677, 111207, 122913, 158031, 259483, 333621, 368739, 778449, 1000863, 1106217, 2335347, 3002589, 7006041, 21018123]

約数ペア:

[(1, 21018123), (3, 7006041), (7, 3002589), (9, 2335347), (19, 1106217), (21, 1000863), (27, 778449), (57, 368739), (63, 333621), (81, 259483), (133, 158031), (171, 122913), (189, 111207), (399, 52677), (513, 40971), (567, 37069), (1197, 17559), (1539, 13657), (1951, 10773), (3591, 5853)]