20205236640504 has 16 divisors (see below), whose sum is σ = 50513091601320. Its totient is φ = 6735078880160.

The previous prime is 20205236640451. The next prime is 20205236640517. The reversal of 20205236640504 is 40504663250202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420942429987 + ... + 420942430034.

Almost surely, 2^{20205236640504} is an apocalyptic number.

20205236640504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20205236640504 is an abundant number, since it is smaller than the sum of its proper divisors (30307854960816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20205236640504 is a wasteful number, since it uses less digits than its factorization.

20205236640504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841884860030 (or 841884860026 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 39.

Adding to 20205236640504 its reverse (40504663250202), we get a palindrome (60709899890706).

The spelling of 20205236640504 in words is "twenty trillion, two hundred five billion, two hundred thirty-six million, six hundred forty thousand, five hundred four".