20624047 has 4 divisors (see below), whose sum is σ = 21103720. Its totient is φ = 20144376.

The previous prime is 20624041. The next prime is 20624069. The reversal of 20624047 is 74042602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74042602 = 2 ⋅37021301.

It is a cyclic number.

It is not a de Polignac number, because 20624047 - 2⁷ = 20623919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20624041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239772 + ... + 239857.

It is an arithmetic number, because the mean of its divisors is an integer number (5275930).

Almost surely, 2^20624047 is an apocalyptic number.

20624047 is a deficient number, since it is larger than the sum of its proper divisors (479673).

20624047 is an equidigital number, since it uses as much as digits as its factorization.

20624047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479672.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 20624047 is about 4541.3706080874. The cubic root of 20624047 is about 274.2361037015.

Adding to 20624047 its reverse (74042602), we get a palindrome (94666649).

The spelling of 20624047 in words is "twenty million, six hundred twenty-four thousand, forty-seven".