20557694 has 8 divisors (see below), whose sum is σ = 31899960. Its totient is φ = 9924376.

The previous prime is 20557673. The next prime is 20557697. The reversal of 20557694 is 49675502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20557697) 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, 177164 + ... + 177279.

It is an arithmetic number, because the mean of its divisors is an integer number (3987495).

Almost surely, 2^20557694 is an apocalyptic number.

20557694 is a deficient number, since it is larger than the sum of its proper divisors (11342266).

20557694 is a wasteful number, since it uses less digits than its factorization.

20557694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354474.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 20557694 is about 4534.0593291222. The cubic root of 20557694 is about 273.9416911106.

The spelling of 20557694 in words is "twenty million, five hundred fifty-seven thousand, six hundred ninety-four".