20246864981 has 4 divisors (see below), whose sum is σ = 23139274272. Its totient is φ = 17354455692.

The previous prime is 20246864947. The next prime is 20246864993. The reversal of 20246864981 is 18946864202.

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 20246864981 - 2⁶ = 20246864917 is a prime.

It is a super-2 number, since 2×20246864981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20246864681) 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, 1446204635 + ... + 1446204648.

It is an arithmetic number, because the mean of its divisors is an integer number (5784818568).

Almost surely, 2^20246864981 is an apocalyptic number.

It is an amenable number.

20246864981 is a deficient number, since it is larger than the sum of its proper divisors (2892409291).

20246864981 is an equidigital number, since it uses as much as digits as its factorization.

20246864981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2892409290.

The product of its (nonzero) digits is 1327104, while the sum is 50.

The spelling of 20246864981 in words is "twenty billion, two hundred forty-six million, eight hundred sixty-four thousand, nine hundred eighty-one".