20857520

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6359}}^1$

素因数の和:6413

約数の個数: 40

約数和(自身を含む): 49684320

約数和(自身を除く): 28826800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6359, 12718, 25436, 31795, 50872, 63590, 101744, 127180, 254360, 260719, 508720, 521438, 1042876, 1303595, 2085752, 2607190, 4171504, 5214380, 10428760, 20857520]

約数ペア:

[(1, 20857520), (2, 10428760), (4, 5214380), (5, 4171504), (8, 2607190), (10, 2085752), (16, 1303595), (20, 1042876), (40, 521438), (41, 508720), (80, 260719), (82, 254360), (164, 127180), (205, 101744), (328, 63590), (410, 50872), (656, 31795), (820, 25436), (1640, 12718), (3280, 6359)]