20209520

素因数分解:

$2^4\times 5^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{281}}^1$

素因数の和:354

約数の個数: 80

約数和(自身を含む): 50353920

約数和(自身を除く): 30144400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 31, 40, 58, 62, 80, 116, 124, 145, 155, 232, 248, 281, 290, 310, 464, 496, 562, 580, 620, 899, 1124, 1160, 1240, 1405, 1798, 2248, 2320, 2480, 2810, 3596, 4495, 4496, 5620, 7192, 8149, 8711, 8990, 11240, 14384, 16298, 17422, 17980, 22480, 32596, 34844, 35960, 40745, 43555, 65192, 69688, 71920, 81490, 87110, 130384, 139376, 162980, 174220, 252619, 325960, 348440, 505238, 651920, 696880, 1010476, 1263095, 2020952, 2526190, 4041904, 5052380, 10104760, 20209520]

約数ペア:

[(1, 20209520), (2, 10104760), (4, 5052380), (5, 4041904), (8, 2526190), (10, 2020952), (16, 1263095), (20, 1010476), (29, 696880), (31, 651920), (40, 505238), (58, 348440), (62, 325960), (80, 252619), (116, 174220), (124, 162980), (145, 139376), (155, 130384), (232, 87110), (248, 81490), (281, 71920), (290, 69688), (310, 65192), (464, 43555), (496, 40745), (562, 35960), (580, 34844), (620, 32596), (899, 22480), (1124, 17980), (1160, 17422), (1240, 16298), (1405, 14384), (1798, 11240), (2248, 8990), (2320, 8711), (2480, 8149), (2810, 7192), (3596, 5620), (4495, 4496)]