21097780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{2339}}^1$

素因数の和:2400

約数の個数: 48

約数和(自身を含む): 49533120

約数和(自身を除く): 28435340

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 41, 44, 55, 82, 110, 164, 205, 220, 410, 451, 820, 902, 1804, 2255, 2339, 4510, 4678, 9020, 9356, 11695, 23390, 25729, 46780, 51458, 95899, 102916, 128645, 191798, 257290, 383596, 479495, 514580, 958990, 1054889, 1917980, 2109778, 4219556, 5274445, 10548890, 21097780]

約数ペア:

[(1, 21097780), (2, 10548890), (4, 5274445), (5, 4219556), (10, 2109778), (11, 1917980), (20, 1054889), (22, 958990), (41, 514580), (44, 479495), (55, 383596), (82, 257290), (110, 191798), (164, 128645), (205, 102916), (220, 95899), (410, 51458), (451, 46780), (820, 25729), (902, 23390), (1804, 11695), (2255, 9356), (2339, 9020), (4510, 4678)]