20778890

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{191}}^1$

素因数の和:275

約数の個数: 64

約数和(自身を含む): 43794432

約数和(自身を除く): 23015542

約数列:

[1, 2, 5, 10, 11, 22, 23, 43, 46, 55, 86, 110, 115, 191, 215, 230, 253, 382, 430, 473, 506, 946, 955, 989, 1265, 1910, 1978, 2101, 2365, 2530, 4202, 4393, 4730, 4945, 8213, 8786, 9890, 10505, 10879, 16426, 21010, 21758, 21965, 41065, 43930, 48323, 54395, 82130, 90343, 96646, 108790, 180686, 188899, 241615, 377798, 451715, 483230, 903430, 944495, 1888990, 2077889, 4155778, 10389445, 20778890]

約数ペア:

[(1, 20778890), (2, 10389445), (5, 4155778), (10, 2077889), (11, 1888990), (22, 944495), (23, 903430), (43, 483230), (46, 451715), (55, 377798), (86, 241615), (110, 188899), (115, 180686), (191, 108790), (215, 96646), (230, 90343), (253, 82130), (382, 54395), (430, 48323), (473, 43930), (506, 41065), (946, 21965), (955, 21758), (989, 21010), (1265, 16426), (1910, 10879), (1978, 10505), (2101, 9890), (2365, 8786), (2530, 8213), (4202, 4945), (4393, 4730)]