21987999

素因数分解:

$3^2\times {\mathrm{11}}^2\times {\mathrm{61}}^1\times {\mathrm{331}}^1$

素因数の和:420

約数の個数: 36

約数和(自身を含む): 35589736

約数和(自身を除く): 13601737

約数列:

[1, 3, 9, 11, 33, 61, 99, 121, 183, 331, 363, 549, 671, 993, 1089, 2013, 2979, 3641, 6039, 7381, 10923, 20191, 22143, 32769, 40051, 60573, 66429, 120153, 181719, 222101, 360459, 666303, 1998909, 2443111, 7329333, 21987999]

約数ペア:

[(1, 21987999), (3, 7329333), (9, 2443111), (11, 1998909), (33, 666303), (61, 360459), (99, 222101), (121, 181719), (183, 120153), (331, 66429), (363, 60573), (549, 40051), (671, 32769), (993, 22143), (1089, 20191), (2013, 10923), (2979, 7381), (3641, 6039)]