21505550

素因数分解:

$2^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{641}}^1$

素因数の和:725

約数の個数: 48

約数和(自身を含む): 44421264

約数和(自身を除く): 22915714

約数列:

[1, 2, 5, 10, 11, 22, 25, 50, 55, 61, 110, 122, 275, 305, 550, 610, 641, 671, 1282, 1342, 1525, 3050, 3205, 3355, 6410, 6710, 7051, 14102, 16025, 16775, 32050, 33550, 35255, 39101, 70510, 78202, 176275, 195505, 352550, 391010, 430111, 860222, 977525, 1955050, 2150555, 4301110, 10752775, 21505550]

約数ペア:

[(1, 21505550), (2, 10752775), (5, 4301110), (10, 2150555), (11, 1955050), (22, 977525), (25, 860222), (50, 430111), (55, 391010), (61, 352550), (110, 195505), (122, 176275), (275, 78202), (305, 70510), (550, 39101), (610, 35255), (641, 33550), (671, 32050), (1282, 16775), (1342, 16025), (1525, 14102), (3050, 7051), (3205, 6710), (3355, 6410)]