20429756 has 6 divisors (see below), whose sum is σ = 35752080. Its totient is φ = 10214876.

The previous prime is 20429723. The next prime is 20429813. The reversal of 20429756 is 65792402.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2553716 + ... + 2553723.

It is an arithmetic number, because the mean of its divisors is an integer number (5958680).

Almost surely, 2^20429756 is an apocalyptic number.

It is an amenable number.

20429756 is a deficient number, since it is larger than the sum of its proper divisors (15322324).

20429756 is a wasteful number, since it uses less digits than its factorization.

20429756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5107443 (or 5107441 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 20429756 is about 4519.9287605005. The cubic root of 20429756 is about 273.3722285849.

The spelling of 20429756 in words is "twenty million, four hundred twenty-nine thousand, seven hundred fifty-six".