20419420

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{929}}^1$

素因数の和:1102

約数の個数: 48

約数和(自身を含む): 49371840

約数和(自身を除く): 28952420

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 157, 314, 628, 785, 929, 1099, 1570, 1858, 2198, 3140, 3716, 4396, 4645, 5495, 6503, 9290, 10990, 13006, 18580, 21980, 26012, 32515, 65030, 130060, 145853, 291706, 583412, 729265, 1020971, 1458530, 2041942, 2917060, 4083884, 5104855, 10209710, 20419420]

約数ペア:

[(1, 20419420), (2, 10209710), (4, 5104855), (5, 4083884), (7, 2917060), (10, 2041942), (14, 1458530), (20, 1020971), (28, 729265), (35, 583412), (70, 291706), (140, 145853), (157, 130060), (314, 65030), (628, 32515), (785, 26012), (929, 21980), (1099, 18580), (1570, 13006), (1858, 10990), (2198, 9290), (3140, 6503), (3716, 5495), (4396, 4645)]