20990218263 has 32 divisors (see below), whose sum is σ = 32789471232. Its totient is φ = 11693203200.

The previous prime is 20990218253. The next prime is 20990218303. The reversal of 20990218263 is 36281209902.

It is not a de Polignac number, because 20990218263 - 2¹³ = 20990210071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20990218253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1258245 + ... + 1274817.

It is an arithmetic number, because the mean of its divisors is an integer number (1024670976).

Almost surely, 2^20990218263 is an apocalyptic number.

20990218263 is a deficient number, since it is larger than the sum of its proper divisors (11799252969).

20990218263 is a wasteful number, since it uses less digits than its factorization.

20990218263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18095.

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 20990218263 in words is "twenty billion, nine hundred ninety million, two hundred eighteen thousand, two hundred sixty-three".