21991761

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{73}}^1\times {\mathrm{179}}^1$

素因数の和:286

約数の個数: 48

約数和(自身を含む): 37402560

約数和(自身を除く): 15410799

約数列:

[1, 3, 9, 11, 17, 33, 51, 73, 99, 153, 179, 187, 219, 537, 561, 657, 803, 1241, 1611, 1683, 1969, 2409, 3043, 3723, 5907, 7227, 9129, 11169, 13067, 13651, 17721, 27387, 33473, 39201, 40953, 100419, 117603, 122859, 143737, 222139, 301257, 431211, 666417, 1293633, 1999251, 2443529, 7330587, 21991761]

約数ペア:

[(1, 21991761), (3, 7330587), (9, 2443529), (11, 1999251), (17, 1293633), (33, 666417), (51, 431211), (73, 301257), (99, 222139), (153, 143737), (179, 122859), (187, 117603), (219, 100419), (537, 40953), (561, 39201), (657, 33473), (803, 27387), (1241, 17721), (1611, 13651), (1683, 13067), (1969, 11169), (2409, 9129), (3043, 7227), (3723, 5907)]