20624554 has 4 divisors (see below), whose sum is σ = 30936834. Its totient is φ = 10312276.

The previous prime is 20624533. The next prime is 20624561. The reversal of 20624554 is 45542602.

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

It can be written as a sum of positive squares in only one way, i.e., 13890529 + 6734025 = 3727^2 + 2595^2 .

It is an unprimeable number.

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, 5156137 + ... + 5156140.

Almost surely, 2^20624554 is an apocalyptic number.

20624554 is a deficient number, since it is larger than the sum of its proper divisors (10312280).

20624554 is a wasteful number, since it uses less digits than its factorization.

20624554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10312279.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 20624554 is about 4541.4264278969. The cubic root of 20624554 is about 274.2383508609.

The spelling of 20624554 in words is "twenty million, six hundred twenty-four thousand, five hundred fifty-four".