20557246 has 4 divisors (see below), whose sum is σ = 30835872. Its totient is φ = 10278622.

The previous prime is 20557241. The next prime is 20557279. The reversal of 20557246 is 64275502.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20557241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5139310 + ... + 5139313.

It is an arithmetic number, because the mean of its divisors is an integer number (7708968).

Almost surely, 2^20557246 is an apocalyptic number.

20557246 is a deficient number, since it is larger than the sum of its proper divisors (10278626).

20557246 is a wasteful number, since it uses less digits than its factorization.

20557246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10278625.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 20557246 is about 4534.0099250002. The cubic root of 20557246 is about 273.9397011538.

The spelling of 20557246 in words is "twenty million, five hundred fifty-seven thousand, two hundred forty-six".