81217925

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{59}}^1\times {\mathrm{79}}^1$

素因数の和:206

約数の個数: 48

約数和(自身を含む): 112492800

約数和(自身を除く): 31274875

約数列:

[1, 5, 17, 25, 41, 59, 79, 85, 205, 295, 395, 425, 697, 1003, 1025, 1343, 1475, 1975, 2419, 3239, 3485, 4661, 5015, 6715, 12095, 16195, 17425, 23305, 25075, 33575, 41123, 55063, 60475, 79237, 80975, 116525, 191101, 205615, 275315, 396185, 955505, 1028075, 1376575, 1980925, 3248717, 4777525, 16243585, 81217925]

約数ペア:

[(1, 81217925), (5, 16243585), (17, 4777525), (25, 3248717), (41, 1980925), (59, 1376575), (79, 1028075), (85, 955505), (205, 396185), (295, 275315), (395, 205615), (425, 191101), (697, 116525), (1003, 80975), (1025, 79237), (1343, 60475), (1475, 55063), (1975, 41123), (2419, 33575), (3239, 25075), (3485, 23305), (4661, 17425), (5015, 16195), (6715, 12095)]