20605002056 has 16 divisors (see below), whose sum is σ = 38636069100. Its totient is φ = 10302050304.

The previous prime is 20605002037. The next prime is 20605002127. The reversal of 20605002056 is 65020050602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20602009156 + 2992900 = 143534^2 + 1730^2 .

It is a super-2 number, since 2×20605002056² (a number of 21 digits) contains 22 as substring.

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, 214580 + ... + 295388.

Almost surely, 2^20605002056 is an apocalyptic number.

It is an amenable number.

20605002056 is a deficient number, since it is larger than the sum of its proper divisors (18031067044).

20605002056 is a wasteful number, since it uses less digits than its factorization.

20605002056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112688 (or 112684 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20605002056 its reverse (65020050602), we get a palindrome (85625052658).

The spelling of 20605002056 in words is "twenty billion, six hundred five million, two thousand, fifty-six".