20438504929 has 4 divisors (see below), whose sum is σ = 20873366784. Its totient is φ = 20003643076.

The previous prime is 20438504921. The next prime is 20438504951. The reversal of 20438504929 is 92940583402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20438504929 - 2³ = 20438504921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20438504921) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 217430857 + ... + 217430950.

It is an arithmetic number, because the mean of its divisors is an integer number (5218341696).

Almost surely, 2^20438504929 is an apocalyptic number.

It is an amenable number.

20438504929 is a deficient number, since it is larger than the sum of its proper divisors (434861855).

20438504929 is an equidigital number, since it uses as much as digits as its factorization.

20438504929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434861854.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 20438504929 in words is "twenty billion, four hundred thirty-eight million, five hundred four thousand, nine hundred twenty-nine".