20694508690 has 16 divisors (see below), whose sum is σ = 37698913728. Its totient is φ = 8178070576.

The previous prime is 20694508657. The next prime is 20694508691. The reversal of 20694508690 is 9680549602.

It is a super-2 number, since 2×20694508690² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20694508691) 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, 12465742 + ... + 12467401.

It is an arithmetic number, because the mean of its divisors is an integer number (2356182108).

Almost surely, 2^20694508690 is an apocalyptic number.

20694508690 is a deficient number, since it is larger than the sum of its proper divisors (17004405038).

20694508690 is a wasteful number, since it uses less digits than its factorization.

20694508690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24933233.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 20694508690 in words is "twenty billion, six hundred ninety-four million, five hundred eight thousand, six hundred ninety".