28212821

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{73}}^1\times {\mathrm{137}}^1$

素因数の和:261

約数の個数: 32

約数和(自身を含む): 36599808

約数和(自身を除く): 8386987

約数列:

[1, 7, 13, 31, 73, 91, 137, 217, 403, 511, 949, 959, 1781, 2263, 2821, 4247, 6643, 10001, 12467, 15841, 29419, 29729, 55211, 70007, 130013, 205933, 310031, 386477, 910091, 2170217, 4030403, 28212821]

約数ペア:

[(1, 28212821), (7, 4030403), (13, 2170217), (31, 910091), (73, 386477), (91, 310031), (137, 205933), (217, 130013), (403, 70007), (511, 55211), (949, 29729), (959, 29419), (1781, 15841), (2263, 12467), (2821, 10001), (4247, 6643)]