20501680

素因数分解:

$2^4\times 5^1\times {\mathrm{251}}^1\times {\mathrm{1021}}^1$

素因数の和:1285

約数の個数: 40

約数和(自身を含む): 47903184

約数和(自身を除く): 27401504

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 251, 502, 1004, 1021, 1255, 2008, 2042, 2510, 4016, 4084, 5020, 5105, 8168, 10040, 10210, 16336, 20080, 20420, 40840, 81680, 256271, 512542, 1025084, 1281355, 2050168, 2562710, 4100336, 5125420, 10250840, 20501680]

約数ペア:

[(1, 20501680), (2, 10250840), (4, 5125420), (5, 4100336), (8, 2562710), (10, 2050168), (16, 1281355), (20, 1025084), (40, 512542), (80, 256271), (251, 81680), (502, 40840), (1004, 20420), (1021, 20080), (1255, 16336), (2008, 10210), (2042, 10040), (2510, 8168), (4016, 5105), (4084, 5020)]