21117519

素因数分解:

$3^2\times {\mathrm{17}}^2\times {\mathrm{23}}^1\times {\mathrm{353}}^1$

素因数の和:416

約数の個数: 36

約数和(自身を含む): 33907536

約数和(自身を除く): 12790017

約数列:

[1, 3, 9, 17, 23, 51, 69, 153, 207, 289, 353, 391, 867, 1059, 1173, 2601, 3177, 3519, 6001, 6647, 8119, 18003, 19941, 24357, 54009, 59823, 73071, 102017, 138023, 306051, 414069, 918153, 1242207, 2346391, 7039173, 21117519]

約数ペア:

[(1, 21117519), (3, 7039173), (9, 2346391), (17, 1242207), (23, 918153), (51, 414069), (69, 306051), (153, 138023), (207, 102017), (289, 73071), (353, 59823), (391, 54009), (867, 24357), (1059, 19941), (1173, 18003), (2601, 8119), (3177, 6647), (3519, 6001)]