21100821

素因数分解:

$3^1\times 7^2\times {\mathrm{23}}^1\times {\mathrm{79}}^2$

素因数の和:198

約数の個数: 36

約数和(自身を含む): 34588512

約数和(自身を除く): 13487691

約数列:

[1, 3, 7, 21, 23, 49, 69, 79, 147, 161, 237, 483, 553, 1127, 1659, 1817, 3381, 3871, 5451, 6241, 11613, 12719, 18723, 38157, 43687, 89033, 131061, 143543, 267099, 305809, 430629, 917427, 1004801, 3014403, 7033607, 21100821]

約数ペア:

[(1, 21100821), (3, 7033607), (7, 3014403), (21, 1004801), (23, 917427), (49, 430629), (69, 305809), (79, 267099), (147, 143543), (161, 131061), (237, 89033), (483, 43687), (553, 38157), (1127, 18723), (1659, 12719), (1817, 11613), (3381, 6241), (3871, 5451)]