20512694 has 4 divisors (see below), whose sum is σ = 30769044. Its totient is φ = 10256346.

The previous prime is 20512691. The next prime is 20512697. The reversal of 20512694 is 49621502.

It is a happy number.

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 (20512691) and next prime (20512697).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20512691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5128172 + ... + 5128175.

It is an arithmetic number, because the mean of its divisors is an integer number (7692261).

Almost surely, 2^20512694 is an apocalyptic number.

20512694 is a deficient number, since it is larger than the sum of its proper divisors (10256350).

20512694 is a wasteful number, since it uses less digits than its factorization.

20512694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10256349.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 20512694 is about 4529.0941699196. The cubic root of 20512694 is about 273.7416624859.

The spelling of 20512694 in words is "twenty million, five hundred twelve thousand, six hundred ninety-four".