20500404623 has 4 divisors (see below), whose sum is σ = 20514457080. Its totient is φ = 20486352168.

The previous prime is 20500404581. The next prime is 20500404697. The reversal of 20500404623 is 32640400502.

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

It is a cyclic number.

It is not a de Polignac number, because 20500404623 - 2¹⁶ = 20500339087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20500404592 and 20500404601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500404523) 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, 7024040 + ... + 7026957.

It is an arithmetic number, because the mean of its divisors is an integer number (5128614270).

Almost surely, 2^20500404623 is an apocalyptic number.

20500404623 is a deficient number, since it is larger than the sum of its proper divisors (14052457).

20500404623 is a wasteful number, since it uses less digits than its factorization.

20500404623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14052456.

The product of its (nonzero) digits is 5760, while the sum is 26.

The spelling of 20500404623 in words is "twenty billion, five hundred million, four hundred four thousand, six hundred twenty-three".