20513634438 has 32 divisors (see below), whose sum is σ = 45797887872. Its totient is φ = 6071688000.

The previous prime is 20513634431. The next prime is 20513634469. The reversal of 20513634438 is 83443631502.

It is a junction number, because it is equal to n+sod(n) for n = 20513634396 and 20513634405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513634431) 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, 3611263 + ... + 3616938.

It is an arithmetic number, because the mean of its divisors is an integer number (1431183996).

Almost surely, 2^20513634438 is an apocalyptic number.

20513634438 is an abundant number, since it is smaller than the sum of its proper divisors (25284253434).

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

20513634438 is a wasteful number, since it uses less digits than its factorization.

20513634438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7228260.

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 20513634438 in words is "twenty billion, five hundred thirteen million, six hundred thirty-four thousand, four hundred thirty-eight".