20120201136 has 60 divisors (see below), whose sum is σ = 64352710032. Its totient is φ = 5748628608.

The previous prime is 20120201081. The next prime is 20120201137. The reversal of 20120201136 is 63110202102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20120201137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9979251 + ... + 9981266.

Almost surely, 2^20120201136 is an apocalyptic number.

It is an amenable number.

20120201136 is an abundant number, since it is smaller than the sum of its proper divisors (44232508896).

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

20120201136 is a wasteful number, since it uses less digits than its factorization.

20120201136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19960538 (or 19960529 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20120201136 its reverse (63110202102), we get a palindrome (83230403238).

The spelling of 20120201136 in words is "twenty billion, one hundred twenty million, two hundred one thousand, one hundred thirty-six".