20520371236 has 24 divisors (see below), whose sum is σ = 36887969216. Its totient is φ = 9981053280.

The previous prime is 20520371213. The next prime is 20520371281. The reversal of 20520371236 is 63217302502.

It is a junction number, because it is equal to n+sod(n) for n = 20520371198 and 20520371207.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1164451 + ... + 1181941.

Almost surely, 2^20520371236 is an apocalyptic number.

It is an amenable number.

20520371236 is a deficient number, since it is larger than the sum of its proper divisors (16367597980).

20520371236 is a wasteful number, since it uses less digits than its factorization.

20520371236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25459 (or 25457 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 31.

Adding to 20520371236 its reverse (63217302502), we get a palindrome (83737673738).

The spelling of 20520371236 in words is "twenty billion, five hundred twenty million, three hundred seventy-one thousand, two hundred thirty-six".