21351843

素因数分解:

$3^4\times {\mathrm{23}}^1\times {\mathrm{73}}^1\times {\mathrm{157}}^1$

素因数の和:265

約数の個数: 40

約数和(自身を含む): 33953568

約数和(自身を除く): 12601725

約数列:

[1, 3, 9, 23, 27, 69, 73, 81, 157, 207, 219, 471, 621, 657, 1413, 1679, 1863, 1971, 3611, 4239, 5037, 5913, 10833, 11461, 12717, 15111, 32499, 34383, 45333, 97497, 103149, 135999, 263603, 292491, 309447, 790809, 928341, 2372427, 7117281, 21351843]

約数ペア:

[(1, 21351843), (3, 7117281), (9, 2372427), (23, 928341), (27, 790809), (69, 309447), (73, 292491), (81, 263603), (157, 135999), (207, 103149), (219, 97497), (471, 45333), (621, 34383), (657, 32499), (1413, 15111), (1679, 12717), (1863, 11461), (1971, 10833), (3611, 5913), (4239, 5037)]