20205221136 has 40 divisors (see below), whose sum is σ = 52485224064. Its totient is φ = 6697860480.

The previous prime is 20205221131. The next prime is 20205221149. The reversal of 20205221136 is 63112250202.

It is a super-2 number, since 2×20205221136² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (20205221131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1154136 + ... + 1171511.

Almost surely, 2^20205221136 is an apocalyptic number.

It is an amenable number.

20205221136 is an abundant number, since it is smaller than the sum of its proper divisors (32280002928).

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

20205221136 is a wasteful number, since it uses less digits than its factorization.

20205221136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2325839 (or 2325833 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 20205221136 its reverse (63112250202), we get a palindrome (83317471338).

The spelling of 20205221136 in words is "twenty billion, two hundred five million, two hundred twenty-one thousand, one hundred thirty-six".