20587138838 has 8 divisors (see below), whose sum is σ = 35292238032. Its totient is φ = 8823059496.

The previous prime is 20587138829. The next prime is 20587138879. The reversal of 20587138838 is 83883178502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20587138838.

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, 735254945 + ... + 735254972.

It is an arithmetic number, because the mean of its divisors is an integer number (4411529754).

Almost surely, 2^20587138838 is an apocalyptic number.

20587138838 is a deficient number, since it is larger than the sum of its proper divisors (14705099194).

20587138838 is a wasteful number, since it uses less digits than its factorization.

20587138838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470509926.

The product of its (nonzero) digits is 2580480, while the sum is 53.

The spelling of 20587138838 in words is "twenty billion, five hundred eighty-seven million, one hundred thirty-eight thousand, eight hundred thirty-eight".