19777815

素因数分解:

$3^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{97}}^1\times {\mathrm{197}}^1$

素因数の和:328

約数の個数: 48

約数和(自身を含む): 36324288

約数和(自身を除く): 16546473

約数列:

[1, 3, 5, 9, 15, 23, 45, 69, 97, 115, 197, 207, 291, 345, 485, 591, 873, 985, 1035, 1455, 1773, 2231, 2955, 4365, 4531, 6693, 8865, 11155, 13593, 19109, 20079, 22655, 33465, 40779, 57327, 67965, 95545, 100395, 171981, 203895, 286635, 439507, 859905, 1318521, 2197535, 3955563, 6592605, 19777815]

約数ペア:

[(1, 19777815), (3, 6592605), (5, 3955563), (9, 2197535), (15, 1318521), (23, 859905), (45, 439507), (69, 286635), (97, 203895), (115, 171981), (197, 100395), (207, 95545), (291, 67965), (345, 57327), (485, 40779), (591, 33465), (873, 22655), (985, 20079), (1035, 19109), (1455, 13593), (1773, 11155), (2231, 8865), (2955, 6693), (4365, 4531)]