21781089

素因数分解:

$3^3\times {\mathrm{11}}^2\times {\mathrm{59}}^1\times {\mathrm{113}}^1$

素因数の和:203

約数の個数: 48

約数和(自身を含む): 36388800

約数和(自身を除く): 14607711

約数列:

[1, 3, 9, 11, 27, 33, 59, 99, 113, 121, 177, 297, 339, 363, 531, 649, 1017, 1089, 1243, 1593, 1947, 3051, 3267, 3729, 5841, 6667, 7139, 11187, 13673, 17523, 20001, 21417, 33561, 41019, 60003, 64251, 73337, 123057, 180009, 192753, 220011, 369171, 660033, 806707, 1980099, 2420121, 7260363, 21781089]

約数ペア:

[(1, 21781089), (3, 7260363), (9, 2420121), (11, 1980099), (27, 806707), (33, 660033), (59, 369171), (99, 220011), (113, 192753), (121, 180009), (177, 123057), (297, 73337), (339, 64251), (363, 60003), (531, 41019), (649, 33561), (1017, 21417), (1089, 20001), (1243, 17523), (1593, 13673), (1947, 11187), (3051, 7139), (3267, 6667), (3729, 5841)]