20691452 has 12 divisors (see below), whose sum is σ = 36328656. Its totient is φ = 10311840.

The previous prime is 20691439. The next prime is 20691457. The reversal of 20691452 is 25419602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20691457) 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 in 3 ways as a sum of consecutive naturals, for example, 7073 + ... + 9560.

It is an arithmetic number, because the mean of its divisors is an integer number (3027388).

Almost surely, 2^20691452 is an apocalyptic number.

It is an amenable number.

20691452 is a deficient number, since it is larger than the sum of its proper divisors (15637204).

20691452 is a wasteful number, since it uses less digits than its factorization.

20691452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16948 (or 16946 counting only the distinct ones).

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

The square root of 20691452 is about 4548.7857720495. The cubic root of 20691452 is about 274.5345382292.

The spelling of 20691452 in words is "twenty million, six hundred ninety-one thousand, four hundred fifty-two".