20555025631 has 6 divisors (see below), whose sum is σ = 23910948240. Its totient is φ = 17618593356.

The previous prime is 20555025629. The next prime is 20555025643. The reversal of 20555025631 is 13652055502.

It is not a de Polignac number, because 20555025631 - 2¹ = 20555025629 is a prime.

It is a super-2 number, since 2×20555025631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555025661) 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 5 ways as a sum of consecutive naturals, for example, 209745111 + ... + 209745208.

It is an arithmetic number, because the mean of its divisors is an integer number (3985158040).

Almost surely, 2^20555025631 is an apocalyptic number.

20555025631 is a deficient number, since it is larger than the sum of its proper divisors (3355922609).

20555025631 is an equidigital number, since it uses as much as digits as its factorization.

20555025631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419490333 (or 419490326 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 34.

The spelling of 20555025631 in words is "twenty billion, five hundred fifty-five million, twenty-five thousand, six hundred thirty-one".