20921895

素因数分解:

$3^4\times 5^1\times {\mathrm{51659}}^1$

素因数の和:51676

約数の個数: 20

約数和(自身を含む): 37505160

約数和(自身を除く): 16583265

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 51659, 154977, 258295, 464931, 774885, 1394793, 2324655, 4184379, 6973965, 20921895]

約数ペア:

[(1, 20921895), (3, 6973965), (5, 4184379), (9, 2324655), (15, 1394793), (27, 774885), (45, 464931), (81, 258295), (135, 154977), (405, 51659)]