20009720

素因数分解:

$2^3\times 5^1\times {\mathrm{251}}^1\times {\mathrm{1993}}^1$

素因数の和:2255

約数の個数: 32

約数和(自身を含む): 45223920

約数和(自身を除く): 25214200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 251, 502, 1004, 1255, 1993, 2008, 2510, 3986, 5020, 7972, 9965, 10040, 15944, 19930, 39860, 79720, 500243, 1000486, 2000972, 2501215, 4001944, 5002430, 10004860, 20009720]

約数ペア:

[(1, 20009720), (2, 10004860), (4, 5002430), (5, 4001944), (8, 2501215), (10, 2000972), (20, 1000486), (40, 500243), (251, 79720), (502, 39860), (1004, 19930), (1255, 15944), (1993, 10040), (2008, 9965), (2510, 7972), (3986, 5020)]