21265220

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1\times {\mathrm{313}}^1$

素因数の和:444

約数の個数: 48

約数和(自身を含む): 46421760

約数和(自身を除く): 25156540

約数列:

[1, 2, 4, 5, 10, 20, 43, 79, 86, 158, 172, 215, 313, 316, 395, 430, 626, 790, 860, 1252, 1565, 1580, 3130, 3397, 6260, 6794, 13459, 13588, 16985, 24727, 26918, 33970, 49454, 53836, 67295, 67940, 98908, 123635, 134590, 247270, 269180, 494540, 1063261, 2126522, 4253044, 5316305, 10632610, 21265220]

約数ペア:

[(1, 21265220), (2, 10632610), (4, 5316305), (5, 4253044), (10, 2126522), (20, 1063261), (43, 494540), (79, 269180), (86, 247270), (158, 134590), (172, 123635), (215, 98908), (313, 67940), (316, 67295), (395, 53836), (430, 49454), (626, 33970), (790, 26918), (860, 24727), (1252, 16985), (1565, 13588), (1580, 13459), (3130, 6794), (3397, 6260)]