81399955

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{199}}^1$

素因数の和:284

約数の個数: 64

約数和(自身を含む): 129024000

約数和(自身を除く): 47624045

約数列:

[1, 5, 7, 13, 29, 31, 35, 65, 91, 145, 155, 199, 203, 217, 377, 403, 455, 899, 995, 1015, 1085, 1393, 1885, 2015, 2587, 2639, 2821, 4495, 5771, 6169, 6293, 6965, 11687, 12935, 13195, 14105, 18109, 28855, 30845, 31465, 40397, 43183, 58435, 75023, 80197, 81809, 90545, 178901, 201985, 215915, 375115, 400985, 409045, 525161, 561379, 894505, 1252307, 2325713, 2625805, 2806895, 6261535, 11628565, 16279991, 81399955]

約数ペア:

[(1, 81399955), (5, 16279991), (7, 11628565), (13, 6261535), (29, 2806895), (31, 2625805), (35, 2325713), (65, 1252307), (91, 894505), (145, 561379), (155, 525161), (199, 409045), (203, 400985), (217, 375115), (377, 215915), (403, 201985), (455, 178901), (899, 90545), (995, 81809), (1015, 80197), (1085, 75023), (1393, 58435), (1885, 43183), (2015, 40397), (2587, 31465), (2639, 30845), (2821, 28855), (4495, 18109), (5771, 14105), (6169, 13195), (6293, 12935), (6965, 11687)]