21787675

素因数分解:

$5^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{157}}^1$

素因数の和:248

約数の個数: 48

約数和(自身を含む): 34011712

約数和(自身を除く): 12224037

約数列:

[1, 5, 7, 13, 25, 35, 61, 65, 91, 157, 175, 305, 325, 427, 455, 785, 793, 1099, 1525, 2041, 2135, 2275, 3925, 3965, 5495, 5551, 9577, 10205, 10675, 14287, 19825, 27475, 27755, 47885, 51025, 67039, 71435, 124501, 138775, 239425, 335195, 357175, 622505, 871507, 1675975, 3112525, 4357535, 21787675]

約数ペア:

[(1, 21787675), (5, 4357535), (7, 3112525), (13, 1675975), (25, 871507), (35, 622505), (61, 357175), (65, 335195), (91, 239425), (157, 138775), (175, 124501), (305, 71435), (325, 67039), (427, 51025), (455, 47885), (785, 27755), (793, 27475), (1099, 19825), (1525, 14287), (2041, 10675), (2135, 10205), (2275, 9577), (3925, 5551), (3965, 5495)]