20631250461 has 4 divisors (see below), whose sum is σ = 27508333952. Its totient is φ = 13754166972.

The previous prime is 20631250399. The next prime is 20631250487. The reversal of 20631250461 is 16405213602.

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 not a de Polignac number, because 20631250461 - 2⁷ = 20631250333 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 (20630250461) 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, 3438541741 + ... + 3438541746.

It is an arithmetic number, because the mean of its divisors is an integer number (6877083488).

Almost surely, 2^20631250461 is an apocalyptic number.

It is an amenable number.

20631250461 is a deficient number, since it is larger than the sum of its proper divisors (6877083491).

20631250461 is an equidigital number, since it uses as much as digits as its factorization.

20631250461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6877083490.

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 20631250461 in words is "twenty billion, six hundred thirty-one million, two hundred fifty thousand, four hundred sixty-one".