20694697 has 4 divisors (see below), whose sum is σ = 20978260. Its totient is φ = 20411136.

The previous prime is 20694691. The next prime is 20694703. The reversal of 20694697 is 79649602.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20694691) and next prime (20694703).

It can be written as a sum of positive squares in 2 ways, for example, as 11909401 + 8785296 = 3451^2 + 2964^2 .

It is a cyclic number.

It is not a de Polignac number, because 20694697 - 2¹¹ = 20692649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20694691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141672 + ... + 141817.

It is an arithmetic number, because the mean of its divisors is an integer number (5244565).

Almost surely, 2^20694697 is an apocalyptic number.

It is an amenable number.

20694697 is a deficient number, since it is larger than the sum of its proper divisors (283563).

20694697 is an equidigital number, since it uses as much as digits as its factorization.

20694697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283562.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 20694697 is about 4549.1424466596. The cubic root of 20694697 is about 274.5488890508.

The spelling of 20694697 in words is "twenty million, six hundred ninety-four thousand, six hundred ninety-seven".