20552957 has 4 divisors (see below), whose sum is σ = 20700960. Its totient is φ = 20404956.

The previous prime is 20552953. The next prime is 20552971. The reversal of 20552957 is 75925502.

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 20552957 - 2² = 20552953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20552951) 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, 73793 + ... + 74070.

It is an arithmetic number, because the mean of its divisors is an integer number (5175240).

Almost surely, 2^20552957 is an apocalyptic number.

It is an amenable number.

20552957 is a deficient number, since it is larger than the sum of its proper divisors (148003).

20552957 is a wasteful number, since it uses less digits than its factorization.

20552957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148002.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 20552957 is about 4533.5369194482. The cubic root of 20552957 is about 273.9206485190.

The spelling of 20552957 in words is "twenty million, five hundred fifty-two thousand, nine hundred fifty-seven".