21980565

素因数分解:

$3^5\times 5^1\times {\mathrm{79}}^1\times {\mathrm{229}}^1$

素因数の和:328

約数の個数: 48

約数和(自身を含む): 40185600

約数和(自身を除く): 18205035

約数列:

[1, 3, 5, 9, 15, 27, 45, 79, 81, 135, 229, 237, 243, 395, 405, 687, 711, 1145, 1185, 1215, 2061, 2133, 3435, 3555, 6183, 6399, 10305, 10665, 18091, 18549, 19197, 30915, 31995, 54273, 55647, 90455, 92745, 95985, 162819, 271365, 278235, 488457, 814095, 1465371, 2442285, 4396113, 7326855, 21980565]

約数ペア:

[(1, 21980565), (3, 7326855), (5, 4396113), (9, 2442285), (15, 1465371), (27, 814095), (45, 488457), (79, 278235), (81, 271365), (135, 162819), (229, 95985), (237, 92745), (243, 90455), (395, 55647), (405, 54273), (687, 31995), (711, 30915), (1145, 19197), (1185, 18549), (1215, 18091), (2061, 10665), (2133, 10305), (3435, 6399), (3555, 6183)]