20155534636 has 6 divisors (see below), whose sum is σ = 35272185620. Its totient is φ = 10077767316.

The previous prime is 20155534631. The next prime is 20155534657. The reversal of 20155534636 is 63643555102.

It is not an unprimeable number, because it can be changed into a prime (20155534631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2519441826 + ... + 2519441833.

Almost surely, 2^20155534636 is an apocalyptic number.

It is an amenable number.

20155534636 is a deficient number, since it is larger than the sum of its proper divisors (15116650984).

20155534636 is a wasteful number, since it uses less digits than its factorization.

20155534636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5038883663 (or 5038883661 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 40.

The spelling of 20155534636 in words is "twenty billion, one hundred fifty-five million, five hundred thirty-four thousand, six hundred thirty-six".