20520670830 has 64 divisors (see below), whose sum is σ = 53758425600. Its totient is φ = 4971784320.

The previous prime is 20520670783. The next prime is 20520670853. The reversal of 20520670830 is 3807602502.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 20520670791 and 20520670800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 572991 + ... + 607749.

It is an arithmetic number, because the mean of its divisors is an integer number (839975400).

Almost surely, 2^20520670830 is an apocalyptic number.

20520670830 is an abundant number, since it is smaller than the sum of its proper divisors (33237754770).

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

20520670830 is a wasteful number, since it uses less digits than its factorization.

20520670830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36569.

The product of its (nonzero) digits is 20160, while the sum is 33.

The spelling of 20520670830 in words is "twenty billion, five hundred twenty million, six hundred seventy thousand, eight hundred thirty".