20631854 has 4 divisors (see below), whose sum is σ = 30947784. Its totient is φ = 10315926.

The previous prime is 20631823. The next prime is 20631857. The reversal of 20631854 is 45813602.

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 (20631857) 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, 5157962 + ... + 5157965.

It is an arithmetic number, because the mean of its divisors is an integer number (7736946).

Almost surely, 2^20631854 is an apocalyptic number.

20631854 is a deficient number, since it is larger than the sum of its proper divisors (10315930).

20631854 is a wasteful number, since it uses less digits than its factorization.

20631854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10315929.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20631854 is about 4542.2300690300. The cubic root of 20631854 is about 274.2707023292.

The spelling of 20631854 in words is "twenty million, six hundred thirty-one thousand, eight hundred fifty-four".