18999309

素因数分解:

$3^1\times 7^2\times {\mathrm{307}}^1\times {\mathrm{421}}^1$

素因数の和:745

約数の個数: 24

約数和(自身を含む): 29634528

約数和(自身を除く): 10635219

約数列:

[1, 3, 7, 21, 49, 147, 307, 421, 921, 1263, 2149, 2947, 6447, 8841, 15043, 20629, 45129, 61887, 129247, 387741, 904729, 2714187, 6333103, 18999309]

約数ペア:

[(1, 18999309), (3, 6333103), (7, 2714187), (21, 904729), (49, 387741), (147, 129247), (307, 61887), (421, 45129), (921, 20629), (1263, 15043), (2149, 8841), (2947, 6447)]