19807975

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{223}}^1$

素因数の和:280

約数の個数: 48

約数和(自身を含む): 29998080

約数和(自身を除く): 10190105

約数列:

[1, 5, 11, 17, 19, 25, 55, 85, 95, 187, 209, 223, 275, 323, 425, 475, 935, 1045, 1115, 1615, 2453, 3553, 3791, 4237, 4675, 5225, 5575, 8075, 12265, 17765, 18955, 21185, 41701, 46607, 61325, 72029, 88825, 94775, 105925, 208505, 233035, 360145, 792319, 1042525, 1165175, 1800725, 3961595, 19807975]

約数ペア:

[(1, 19807975), (5, 3961595), (11, 1800725), (17, 1165175), (19, 1042525), (25, 792319), (55, 360145), (85, 233035), (95, 208505), (187, 105925), (209, 94775), (223, 88825), (275, 72029), (323, 61325), (425, 46607), (475, 41701), (935, 21185), (1045, 18955), (1115, 17765), (1615, 12265), (2453, 8075), (3553, 5575), (3791, 5225), (4237, 4675)]