21021975

素因数分解:

$3^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{7187}}^1$

素因数の和:7216

約数の個数: 36

約数和(自身を含む): 40554696

約数和(自身を除く): 19532721

約数列:

[1, 3, 5, 9, 13, 15, 25, 39, 45, 65, 75, 117, 195, 225, 325, 585, 975, 2925, 7187, 21561, 35935, 64683, 93431, 107805, 179675, 280293, 323415, 467155, 539025, 840879, 1401465, 1617075, 2335775, 4204395, 7007325, 21021975]

約数ペア:

[(1, 21021975), (3, 7007325), (5, 4204395), (9, 2335775), (13, 1617075), (15, 1401465), (25, 840879), (39, 539025), (45, 467155), (65, 323415), (75, 280293), (117, 179675), (195, 107805), (225, 93431), (325, 64683), (585, 35935), (975, 21561), (2925, 7187)]