21560980

素因数分解:

$2^2\times 5^1\times 7^4\times {\mathrm{449}}^1$

素因数の和:486

約数の個数: 60

約数和(自身を含む): 52938900

約数和(自身を除く): 31377920

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 343, 449, 490, 686, 898, 980, 1372, 1715, 1796, 2245, 2401, 3143, 3430, 4490, 4802, 6286, 6860, 8980, 9604, 12005, 12572, 15715, 22001, 24010, 31430, 44002, 48020, 62860, 88004, 110005, 154007, 220010, 308014, 440020, 616028, 770035, 1078049, 1540070, 2156098, 3080140, 4312196, 5390245, 10780490, 21560980]

約数ペア:

[(1, 21560980), (2, 10780490), (4, 5390245), (5, 4312196), (7, 3080140), (10, 2156098), (14, 1540070), (20, 1078049), (28, 770035), (35, 616028), (49, 440020), (70, 308014), (98, 220010), (140, 154007), (196, 110005), (245, 88004), (343, 62860), (449, 48020), (490, 44002), (686, 31430), (898, 24010), (980, 22001), (1372, 15715), (1715, 12572), (1796, 12005), (2245, 9604), (2401, 8980), (3143, 6860), (3430, 6286), (4490, 4802)]