20156624213 has 4 divisors (see below), whose sum is σ = 21989044608. Its totient is φ = 18324203820.

The previous prime is 20156624207. The next prime is 20156624227. The reversal of 20156624213 is 31242665102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20156624213 - 2³² = 15861656917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20156624213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20156624263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 916210181 + ... + 916210202.

It is an arithmetic number, because the mean of its divisors is an integer number (5497261152).

Almost surely, 2^20156624213 is an apocalyptic number.

It is an amenable number.

20156624213 is a deficient number, since it is larger than the sum of its proper divisors (1832420395).

20156624213 is a wasteful number, since it uses less digits than its factorization.

20156624213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832420394.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 20156624213 in words is "twenty billion, one hundred fifty-six million, six hundred twenty-four thousand, two hundred thirteen".