21347240

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31393}}^1$

素因数の和:31421

約数の個数: 32

約数和(自身を含む): 50858280

約数和(自身を除く): 29511040

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680, 31393, 62786, 125572, 156965, 251144, 313930, 533681, 627860, 1067362, 1255720, 2134724, 2668405, 4269448, 5336810, 10673620, 21347240]

約数ペア:

[(1, 21347240), (2, 10673620), (4, 5336810), (5, 4269448), (8, 2668405), (10, 2134724), (17, 1255720), (20, 1067362), (34, 627860), (40, 533681), (68, 313930), (85, 251144), (136, 156965), (170, 125572), (340, 62786), (680, 31393)]