19870235

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{73}}^1\times {\mathrm{101}}^1$

素因数の和:204

約数の個数: 48

約数和(自身を含む): 30976992

約数和(自身を除く): 11106757

約数列:

[1, 5, 7, 11, 35, 49, 55, 73, 77, 101, 245, 365, 385, 505, 511, 539, 707, 803, 1111, 2555, 2695, 3535, 3577, 4015, 4949, 5555, 5621, 7373, 7777, 17885, 24745, 28105, 36865, 38885, 39347, 51611, 54439, 81103, 196735, 258055, 272195, 361277, 405515, 567721, 1806385, 2838605, 3974047, 19870235]

約数ペア:

[(1, 19870235), (5, 3974047), (7, 2838605), (11, 1806385), (35, 567721), (49, 405515), (55, 361277), (73, 272195), (77, 258055), (101, 196735), (245, 81103), (365, 54439), (385, 51611), (505, 39347), (511, 38885), (539, 36865), (707, 28105), (803, 24745), (1111, 17885), (2555, 7777), (2695, 7373), (3535, 5621), (3577, 5555), (4015, 4949)]