20536391078 has 24 divisors (see below), whose sum is σ = 35881373232. Its totient is φ = 8789652144.

The previous prime is 20536391069. The next prime is 20536391107. The reversal of 20536391078 is 87019363502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64226 + ... + 212597.

It is an arithmetic number, because the mean of its divisors is an integer number (1495057218).

Almost surely, 2^20536391078 is an apocalyptic number.

20536391078 is a deficient number, since it is larger than the sum of its proper divisors (15344982154).

20536391078 is a wasteful number, since it uses less digits than its factorization.

20536391078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277596 (or 277589 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 20536391078 in words is "twenty billion, five hundred thirty-six million, three hundred ninety-one thousand, seventy-eight".