20803562613 has 16 divisors (see below), whose sum is σ = 31653069760. Its totient is φ = 13494202128.

The previous prime is 20803562599. The next prime is 20803562621. The reversal of 20803562613 is 31626530802.

It is a happy number.

20803562613 is a `hidden beast` number, since 2 + 0 + 8 + 0 + 35 + 6 + 2 + 613 = 666.

It is not a de Polignac number, because 20803562613 - 2⁵ = 20803562581 is a prime.

It is a super-2 number, since 2×20803562613² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20803562653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10411195 + ... + 10413192.

It is an arithmetic number, because the mean of its divisors is an integer number (1978316860).

Almost surely, 2^20803562613 is an apocalyptic number.

It is an amenable number.

20803562613 is a deficient number, since it is larger than the sum of its proper divisors (10849507147).

20803562613 is a wasteful number, since it uses less digits than its factorization.

20803562613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20824433 (or 20824427 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 20803562613 in words is "twenty billion, eight hundred three million, five hundred sixty-two thousand, six hundred thirteen".