21870513

素因数分解:

$3^3\times 7^2\times {\mathrm{61}}^1\times {\mathrm{271}}^1$

素因数の和:355

約数の個数: 48

約数和(自身を含む): 38449920

約数和(自身を除く): 16579407

約数列:

[1, 3, 7, 9, 21, 27, 49, 61, 63, 147, 183, 189, 271, 427, 441, 549, 813, 1281, 1323, 1647, 1897, 2439, 2989, 3843, 5691, 7317, 8967, 11529, 13279, 16531, 17073, 26901, 39837, 49593, 51219, 80703, 115717, 119511, 148779, 347151, 358533, 446337, 810019, 1041453, 2430057, 3124359, 7290171, 21870513]

約数ペア:

[(1, 21870513), (3, 7290171), (7, 3124359), (9, 2430057), (21, 1041453), (27, 810019), (49, 446337), (61, 358533), (63, 347151), (147, 148779), (183, 119511), (189, 115717), (271, 80703), (427, 51219), (441, 49593), (549, 39837), (813, 26901), (1281, 17073), (1323, 16531), (1647, 13279), (1897, 11529), (2439, 8967), (2989, 7317), (3843, 5691)]