21000903

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{229}}^1\times {\mathrm{397}}^1$

素因数の和:647

約数の個数: 32

約数和(自身を含む): 35151360

約数和(自身を除く): 14150457

約数列:

[1, 3, 7, 11, 21, 33, 77, 229, 231, 397, 687, 1191, 1603, 2519, 2779, 4367, 4809, 7557, 8337, 13101, 17633, 30569, 52899, 90913, 91707, 272739, 636391, 1000043, 1909173, 3000129, 7000301, 21000903]

約数ペア:

[(1, 21000903), (3, 7000301), (7, 3000129), (11, 1909173), (21, 1000043), (33, 636391), (77, 272739), (229, 91707), (231, 90913), (397, 52899), (687, 30569), (1191, 17633), (1603, 13101), (2519, 8337), (2779, 7557), (4367, 4809)]