17921995

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{331}}^1$

素因数の和:380

約数の個数: 48

約数和(自身を含む): 28613088

約数和(自身を除く): 10691093

約数列:

[1, 5, 7, 13, 17, 35, 49, 65, 85, 91, 119, 221, 245, 331, 455, 595, 637, 833, 1105, 1547, 1655, 2317, 3185, 4165, 4303, 5627, 7735, 10829, 11585, 16219, 21515, 28135, 30121, 39389, 54145, 73151, 81095, 150605, 196945, 210847, 275723, 365755, 512057, 1054235, 1378615, 2560285, 3584399, 17921995]

約数ペア:

[(1, 17921995), (5, 3584399), (7, 2560285), (13, 1378615), (17, 1054235), (35, 512057), (49, 365755), (65, 275723), (85, 210847), (91, 196945), (119, 150605), (221, 81095), (245, 73151), (331, 54145), (455, 39389), (595, 30121), (637, 28135), (833, 21515), (1105, 16219), (1547, 11585), (1655, 10829), (2317, 7735), (3185, 5627), (4165, 4303)]