21086975

素因数分解:

$5^2\times 7^1\times {\mathrm{13}}^2\times {\mathrm{23}}^1\times {\mathrm{31}}^1$

素因数の和:97

約数の個数: 72

約数和(自身を含む): 34854912

約数和(自身を除く): 13767937

約数列:

[1, 5, 7, 13, 23, 25, 31, 35, 65, 91, 115, 155, 161, 169, 175, 217, 299, 325, 403, 455, 575, 713, 775, 805, 845, 1085, 1183, 1495, 2015, 2093, 2275, 2821, 3565, 3887, 4025, 4225, 4991, 5239, 5425, 5915, 7475, 9269, 10075, 10465, 14105, 17825, 19435, 24955, 26195, 27209, 29575, 36673, 46345, 52325, 64883, 70525, 97175, 120497, 124775, 130975, 136045, 183365, 231725, 324415, 602485, 680225, 843479, 916825, 1622075, 3012425, 4217395, 21086975]

約数ペア:

[(1, 21086975), (5, 4217395), (7, 3012425), (13, 1622075), (23, 916825), (25, 843479), (31, 680225), (35, 602485), (65, 324415), (91, 231725), (115, 183365), (155, 136045), (161, 130975), (169, 124775), (175, 120497), (217, 97175), (299, 70525), (325, 64883), (403, 52325), (455, 46345), (575, 36673), (713, 29575), (775, 27209), (805, 26195), (845, 24955), (1085, 19435), (1183, 17825), (1495, 14105), (2015, 10465), (2093, 10075), (2275, 9269), (2821, 7475), (3565, 5915), (3887, 5425), (4025, 5239), (4225, 4991)]