399372280

素因数分解:

$2^3\times 5^1\times {\mathrm{97}}^1\times {\mathrm{102931}}^1$

素因数の和:103039

約数の個数: 32

約数和(自身を含む): 907860240

約数和(自身を除く): 508487960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 97, 194, 388, 485, 776, 970, 1940, 3880, 102931, 205862, 411724, 514655, 823448, 1029310, 2058620, 4117240, 9984307, 19968614, 39937228, 49921535, 79874456, 99843070, 199686140, 399372280]

約数ペア:

[(1, 399372280), (2, 199686140), (4, 99843070), (5, 79874456), (8, 49921535), (10, 39937228), (20, 19968614), (40, 9984307), (97, 4117240), (194, 2058620), (388, 1029310), (485, 823448), (776, 514655), (970, 411724), (1940, 205862), (3880, 102931)]