20680940

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{47}}^1\times {\mathrm{449}}^1$

素因数の和:519

約数の個数: 72

約数和(自身を含む): 51710400

約数和(自身を除く): 31029460

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 47, 49, 70, 94, 98, 140, 188, 196, 235, 245, 329, 449, 470, 490, 658, 898, 940, 980, 1316, 1645, 1796, 2245, 2303, 3143, 3290, 4490, 4606, 6286, 6580, 8980, 9212, 11515, 12572, 15715, 21103, 22001, 23030, 31430, 42206, 44002, 46060, 62860, 84412, 88004, 105515, 110005, 147721, 211030, 220010, 295442, 422060, 440020, 590884, 738605, 1034047, 1477210, 2068094, 2954420, 4136188, 5170235, 10340470, 20680940]

約数ペア:

[(1, 20680940), (2, 10340470), (4, 5170235), (5, 4136188), (7, 2954420), (10, 2068094), (14, 1477210), (20, 1034047), (28, 738605), (35, 590884), (47, 440020), (49, 422060), (70, 295442), (94, 220010), (98, 211030), (140, 147721), (188, 110005), (196, 105515), (235, 88004), (245, 84412), (329, 62860), (449, 46060), (470, 44002), (490, 42206), (658, 31430), (898, 23030), (940, 22001), (980, 21103), (1316, 15715), (1645, 12572), (1796, 11515), (2245, 9212), (2303, 8980), (3143, 6580), (3290, 6286), (4490, 4606)]