21428750

素因数分解:

$2^1\times 5^4\times 7^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1$

素因数の和:139

約数の個数: 80

約数和(自身を含む): 47984640

約数和(自身を除く): 26555890

約数列:

[1, 2, 5, 7, 10, 14, 25, 31, 35, 50, 62, 70, 79, 125, 155, 158, 175, 217, 250, 310, 350, 395, 434, 553, 625, 775, 790, 875, 1085, 1106, 1250, 1550, 1750, 1975, 2170, 2449, 2765, 3875, 3950, 4375, 4898, 5425, 5530, 7750, 8750, 9875, 10850, 12245, 13825, 17143, 19375, 19750, 24490, 27125, 27650, 34286, 38750, 49375, 54250, 61225, 69125, 85715, 98750, 122450, 135625, 138250, 171430, 271250, 306125, 345625, 428575, 612250, 691250, 857150, 1530625, 2142875, 3061250, 4285750, 10714375, 21428750]

約数ペア:

[(1, 21428750), (2, 10714375), (5, 4285750), (7, 3061250), (10, 2142875), (14, 1530625), (25, 857150), (31, 691250), (35, 612250), (50, 428575), (62, 345625), (70, 306125), (79, 271250), (125, 171430), (155, 138250), (158, 135625), (175, 122450), (217, 98750), (250, 85715), (310, 69125), (350, 61225), (395, 54250), (434, 49375), (553, 38750), (625, 34286), (775, 27650), (790, 27125), (875, 24490), (1085, 19750), (1106, 19375), (1250, 17143), (1550, 13825), (1750, 12245), (1975, 10850), (2170, 9875), (2449, 8750), (2765, 7750), (3875, 5530), (3950, 5425), (4375, 4898)]