20620333136 has 20 divisors (see below), whose sum is σ = 43025118612. Its totient is φ = 9517076736.

The previous prime is 20620333109. The next prime is 20620333169. The reversal of 20620333136 is 63133302602.

It can be written as a sum of positive squares in 2 ways, for example, as 3813803536 + 16806529600 = 61756^2 + 129640^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20620333099 and 20620333108.

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, 49567901 + ... + 49568316.

Almost surely, 2^20620333136 is an apocalyptic number.

20620333136 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20620333136 is an abundant number, since it is smaller than the sum of its proper divisors (22404785476).

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

20620333136 is a wasteful number, since it uses less digits than its factorization.

20620333136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99136238 (or 99136232 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 29.

Adding to 20620333136 its reverse (63133302602), we get a palindrome (83753635738).

The spelling of 20620333136 in words is "twenty billion, six hundred twenty million, three hundred thirty-three thousand, one hundred thirty-six".