20938420

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{97}}^1\times {\mathrm{251}}^1$

素因数の和:400

約数の個数: 48

約数和(自身を含む): 45638208

約数和(自身を除く): 24699788

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 97, 172, 194, 215, 251, 388, 430, 485, 502, 860, 970, 1004, 1255, 1940, 2510, 4171, 5020, 8342, 10793, 16684, 20855, 21586, 24347, 41710, 43172, 48694, 53965, 83420, 97388, 107930, 121735, 215860, 243470, 486940, 1046921, 2093842, 4187684, 5234605, 10469210, 20938420]

約数ペア:

[(1, 20938420), (2, 10469210), (4, 5234605), (5, 4187684), (10, 2093842), (20, 1046921), (43, 486940), (86, 243470), (97, 215860), (172, 121735), (194, 107930), (215, 97388), (251, 83420), (388, 53965), (430, 48694), (485, 43172), (502, 41710), (860, 24347), (970, 21586), (1004, 20855), (1255, 16684), (1940, 10793), (2510, 8342), (4171, 5020)]