19808920

素因数分解:

$2^3\times 5^1\times {\mathrm{251}}^1\times {\mathrm{1973}}^1$

素因数の和:2235

約数の個数: 32

約数和(自身を含む): 44770320

約数和(自身を除く): 24961400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 251, 502, 1004, 1255, 1973, 2008, 2510, 3946, 5020, 7892, 9865, 10040, 15784, 19730, 39460, 78920, 495223, 990446, 1980892, 2476115, 3961784, 4952230, 9904460, 19808920]

約数ペア:

[(1, 19808920), (2, 9904460), (4, 4952230), (5, 3961784), (8, 2476115), (10, 1980892), (20, 990446), (40, 495223), (251, 78920), (502, 39460), (1004, 19730), (1255, 15784), (1973, 10040), (2008, 9865), (2510, 7892), (3946, 5020)]