20805254 has 4 divisors (see below), whose sum is σ = 31207884. Its totient is φ = 10402626.

The previous prime is 20805223. The next prime is 20805259. The reversal of 20805254 is 45250802.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20805259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5201312 + ... + 5201315.

It is an arithmetic number, because the mean of its divisors is an integer number (7801971).

Almost surely, 2^20805254 is an apocalyptic number.

20805254 is a deficient number, since it is larger than the sum of its proper divisors (10402630).

20805254 is a wasteful number, since it uses less digits than its factorization.

20805254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10402629.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 20805254 is about 4561.2776718810. The cubic root of 20805254 is about 275.0369272726.

The spelling of 20805254 in words is "twenty million, eight hundred five thousand, two hundred fifty-four".