21778820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{73}}^1\times {\mathrm{2131}}^1$

素因数の和:2220

約数の個数: 48

約数和(自身を含む): 53010048

約数和(自身を除く): 31231228

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 73, 140, 146, 292, 365, 511, 730, 1022, 1460, 2044, 2131, 2555, 4262, 5110, 8524, 10220, 10655, 14917, 21310, 29834, 42620, 59668, 74585, 149170, 155563, 298340, 311126, 622252, 777815, 1088941, 1555630, 2177882, 3111260, 4355764, 5444705, 10889410, 21778820]

約数ペア:

[(1, 21778820), (2, 10889410), (4, 5444705), (5, 4355764), (7, 3111260), (10, 2177882), (14, 1555630), (20, 1088941), (28, 777815), (35, 622252), (70, 311126), (73, 298340), (140, 155563), (146, 149170), (292, 74585), (365, 59668), (511, 42620), (730, 29834), (1022, 21310), (1460, 14917), (2044, 10655), (2131, 10220), (2555, 8524), (4262, 5110)]