21386768

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{229}}^1\times {\mathrm{449}}^1$

素因数の和:699

約数の個数: 40

約数和(自身を含む): 44919000

約数和(自身を除く): 23532232

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 229, 449, 458, 898, 916, 1796, 1832, 2977, 3592, 3664, 5837, 5954, 7184, 11674, 11908, 23348, 23816, 46696, 47632, 93392, 102821, 205642, 411284, 822568, 1336673, 1645136, 2673346, 5346692, 10693384, 21386768]

約数ペア:

[(1, 21386768), (2, 10693384), (4, 5346692), (8, 2673346), (13, 1645136), (16, 1336673), (26, 822568), (52, 411284), (104, 205642), (208, 102821), (229, 93392), (449, 47632), (458, 46696), (898, 23816), (916, 23348), (1796, 11908), (1832, 11674), (2977, 7184), (3592, 5954), (3664, 5837)]