20604957 has 4 divisors (see below), whose sum is σ = 27473280. Its totient is φ = 13736636.

The previous prime is 20604931. The next prime is 20604959. The reversal of 20604957 is 75940602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20604957 - 2²³ = 12216349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20604959) 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, 3434157 + ... + 3434162.

It is an arithmetic number, because the mean of its divisors is an integer number (6868320).

Almost surely, 2^20604957 is an apocalyptic number.

It is an amenable number.

20604957 is a deficient number, since it is larger than the sum of its proper divisors (6868323).

20604957 is an equidigital number, since it uses as much as digits as its factorization.

20604957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6868322.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20604957 is about 4539.2683331127. The cubic root of 20604957 is about 274.1514649090.

Adding to 20604957 its sum of digits (33), we get a triangular number (20604990 = T₆₄₁₉).

The spelling of 20604957 in words is "twenty million, six hundred four thousand, nine hundred fifty-seven".