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20729629 is a prime number
BaseRepresentation
bin100111100010…
…0111100011101
31110000011201001
41033010330131
520301322004
62020150301
7341125144
oct117047435
943004631
1020729629
1110779528
126b38391
1343aa56b
142a7875b
151c471a4
hex13c4f1d

20729629 has 2 divisors, whose sum is σ = 20729630. Its totient is φ = 20729628.

The previous prime is 20729623. The next prime is 20729633. The reversal of 20729629 is 92692702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14364100 + 6365529 = 3790^2 + 2523^2 .

It is a cyclic number.

It is not a de Polignac number, because 20729629 - 29 = 20729117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20729623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10364814 + 10364815.

It is an arithmetic number, because the mean of its divisors is an integer number (10364815).

Almost surely, 220729629 is an apocalyptic number.

It is an amenable number.

20729629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20729629 is an equidigital number, since it uses as much as digits as its factorization.

20729629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 20729629 is about 4552.9802327706. The cubic root of 20729629 is about 274.7032788553.

The spelling of 20729629 in words is "twenty million, seven hundred twenty-nine thousand, six hundred twenty-nine".