20662991069 has 16 divisors (see below), whose sum is σ = 24384138240. Its totient is φ = 17134519680.

The previous prime is 20662991047. The next prime is 20662991077. The reversal of 20662991069 is 96019926602.

It is a cyclic number.

It is not a de Polignac number, because 20662991069 - 2¹⁶ = 20662925533 is a prime.

It is a super-2 number, since 2×20662991069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20662991039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 792017 + ... + 817689.

It is an arithmetic number, because the mean of its divisors is an integer number (1524008640).

Almost surely, 2^20662991069 is an apocalyptic number.

It is an amenable number.

20662991069 is a deficient number, since it is larger than the sum of its proper divisors (3721147171).

20662991069 is a wasteful number, since it uses less digits than its factorization.

20662991069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29420.

The product of its (nonzero) digits is 629856, while the sum is 50.

The spelling of 20662991069 in words is "twenty billion, six hundred sixty-two million, nine hundred ninety-one thousand, sixty-nine".