21691881

素因数分解:

$3^5\times {\mathrm{17}}^1\times {\mathrm{59}}^1\times {\mathrm{89}}^1$

素因数の和:180

約数の個数: 48

約数和(自身を含む): 35380800

約数和(自身を除く): 13688919

約数列:

[1, 3, 9, 17, 27, 51, 59, 81, 89, 153, 177, 243, 267, 459, 531, 801, 1003, 1377, 1513, 1593, 2403, 3009, 4131, 4539, 4779, 5251, 7209, 9027, 13617, 14337, 15753, 21627, 27081, 40851, 47259, 81243, 89267, 122553, 141777, 243729, 267801, 367659, 425331, 803403, 1275993, 2410209, 7230627, 21691881]

約数ペア:

[(1, 21691881), (3, 7230627), (9, 2410209), (17, 1275993), (27, 803403), (51, 425331), (59, 367659), (81, 267801), (89, 243729), (153, 141777), (177, 122553), (243, 89267), (267, 81243), (459, 47259), (531, 40851), (801, 27081), (1003, 21627), (1377, 15753), (1513, 14337), (1593, 13617), (2403, 9027), (3009, 7209), (4131, 5251), (4539, 4779)]