21258585

素因数分解:

$3^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{59}}^1\times {\mathrm{157}}^1$

素因数の和:247

約数の個数: 64

約数和(自身を含む): 40953600

約数和(自身を除く): 19695015

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 59, 85, 135, 153, 157, 177, 255, 295, 459, 471, 531, 765, 785, 885, 1003, 1413, 1593, 2295, 2355, 2655, 2669, 3009, 4239, 5015, 7065, 7965, 8007, 9027, 9263, 13345, 15045, 21195, 24021, 27081, 27789, 40035, 45135, 46315, 72063, 83367, 120105, 135405, 138945, 157471, 250101, 360315, 416835, 472413, 787355, 1250505, 1417239, 2362065, 4251717, 7086195, 21258585]

約数ペア:

[(1, 21258585), (3, 7086195), (5, 4251717), (9, 2362065), (15, 1417239), (17, 1250505), (27, 787355), (45, 472413), (51, 416835), (59, 360315), (85, 250101), (135, 157471), (153, 138945), (157, 135405), (177, 120105), (255, 83367), (295, 72063), (459, 46315), (471, 45135), (531, 40035), (765, 27789), (785, 27081), (885, 24021), (1003, 21195), (1413, 15045), (1593, 13345), (2295, 9263), (2355, 9027), (2655, 8007), (2669, 7965), (3009, 7065), (4239, 5015)]