20508854 has 4 divisors (see below), whose sum is σ = 30763284. Its totient is φ = 10254426.

The previous prime is 20508853. The next prime is 20508877. The reversal of 20508854 is 45880502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45880502 = 2 ⋅22940251.

It is a super-2 number, since 2×20508854² = 841226184786632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20508854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20508853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5127212 + ... + 5127215.

It is an arithmetic number, because the mean of its divisors is an integer number (7690821).

Almost surely, 2^20508854 is an apocalyptic number.

20508854 is a deficient number, since it is larger than the sum of its proper divisors (10254430).

20508854 is a wasteful number, since it uses less digits than its factorization.

20508854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10254429.

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 20508854 is about 4528.6702242491. The cubic root of 20508854 is about 273.7245798348.

The spelling of 20508854 in words is "twenty million, five hundred eight thousand, eight hundred fifty-four".