20451541213 has 4 divisors (see below), whose sum is σ = 20697945408. Its totient is φ = 20205137020.

The previous prime is 20451541183. The next prime is 20451541217. The reversal of 20451541213 is 31214515402.

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 a de Polignac number, because none of the positive numbers 2^k-20451541213 is a prime.

It is a super-2 number, since 2×20451541213² (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 (20451541217) 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, 123201973 + ... + 123202138.

It is an arithmetic number, because the mean of its divisors is an integer number (5174486352).

Almost surely, 2^20451541213 is an apocalyptic number.

It is an amenable number.

20451541213 is a deficient number, since it is larger than the sum of its proper divisors (246404195).

20451541213 is an equidigital number, since it uses as much as digits as its factorization.

20451541213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246404194.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 20451541213 in words is "twenty billion, four hundred fifty-one million, five hundred forty-one thousand, two hundred thirteen".