21129615

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{1901}}^1$

素因数の和:1944

約数の個数: 48

約数和(自身を含む): 41539680

約数和(自身を除く): 20410065

約数列:

[1, 3, 5, 9, 13, 15, 19, 39, 45, 57, 65, 95, 117, 171, 195, 247, 285, 585, 741, 855, 1235, 1901, 2223, 3705, 5703, 9505, 11115, 17109, 24713, 28515, 36119, 74139, 85545, 108357, 123565, 180595, 222417, 325071, 370695, 469547, 541785, 1112085, 1408641, 1625355, 2347735, 4225923, 7043205, 21129615]

約数ペア:

[(1, 21129615), (3, 7043205), (5, 4225923), (9, 2347735), (13, 1625355), (15, 1408641), (19, 1112085), (39, 541785), (45, 469547), (57, 370695), (65, 325071), (95, 222417), (117, 180595), (171, 123565), (195, 108357), (247, 85545), (285, 74139), (585, 36119), (741, 28515), (855, 24713), (1235, 17109), (1901, 11115), (2223, 9505), (3705, 5703)]