21605745

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{1381}}^1$

素因数の和:1545

約数の個数: 32

約数和(自身を含む): 39801600

約数和(自身を除く): 18195855

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 149, 447, 745, 1043, 1381, 2235, 3129, 4143, 5215, 6905, 9667, 15645, 20715, 29001, 48335, 145005, 205769, 617307, 1028845, 1440383, 3086535, 4321149, 7201915, 21605745]

約数ペア:

[(1, 21605745), (3, 7201915), (5, 4321149), (7, 3086535), (15, 1440383), (21, 1028845), (35, 617307), (105, 205769), (149, 145005), (447, 48335), (745, 29001), (1043, 20715), (1381, 15645), (2235, 9667), (3129, 6905), (4143, 5215)]