20469800639 has 4 divisors (see below), whose sum is σ = 20483832120. Its totient is φ = 20455769160.

The previous prime is 20469800629. The next prime is 20469800641. The reversal of 20469800639 is 93600896402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20469800639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20469800593 and 20469800602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20469800629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7013552 + ... + 7016469.

It is an arithmetic number, because the mean of its divisors is an integer number (5120958030).

Almost surely, 2^20469800639 is an apocalyptic number.

20469800639 is a deficient number, since it is larger than the sum of its proper divisors (14031481).

20469800639 is a wasteful number, since it uses less digits than its factorization.

20469800639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14031480.

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 20469800639 in words is "twenty billion, four hundred sixty-nine million, eight hundred thousand, six hundred thirty-nine".