21787720

素因数分解:

$2^3\times 5^1\times {\mathrm{101}}^1\times {\mathrm{5393}}^1$

素因数の和:5505

約数の個数: 32

約数和(自身を含む): 49516920

約数和(自身を除く): 27729200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 101, 202, 404, 505, 808, 1010, 2020, 4040, 5393, 10786, 21572, 26965, 43144, 53930, 107860, 215720, 544693, 1089386, 2178772, 2723465, 4357544, 5446930, 10893860, 21787720]

約数ペア:

[(1, 21787720), (2, 10893860), (4, 5446930), (5, 4357544), (8, 2723465), (10, 2178772), (20, 1089386), (40, 544693), (101, 215720), (202, 107860), (404, 53930), (505, 43144), (808, 26965), (1010, 21572), (2020, 10786), (4040, 5393)]