20765955

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{1487}}^1$

素因数の和:1528

約数の個数: 48

約数和(自身を含む): 40711680

約数和(自身を除く): 19945725

約数列:

[1, 3, 5, 7, 15, 19, 21, 35, 49, 57, 95, 105, 133, 147, 245, 285, 399, 665, 735, 931, 1487, 1995, 2793, 4461, 4655, 7435, 10409, 13965, 22305, 28253, 31227, 52045, 72863, 84759, 141265, 156135, 197771, 218589, 364315, 423795, 593313, 988855, 1092945, 1384397, 2966565, 4153191, 6921985, 20765955]

約数ペア:

[(1, 20765955), (3, 6921985), (5, 4153191), (7, 2966565), (15, 1384397), (19, 1092945), (21, 988855), (35, 593313), (49, 423795), (57, 364315), (95, 218589), (105, 197771), (133, 156135), (147, 141265), (245, 84759), (285, 72863), (399, 52045), (665, 31227), (735, 28253), (931, 22305), (1487, 13965), (1995, 10409), (2793, 7435), (4461, 4655)]