20741506457 has 4 divisors (see below), whose sum is σ = 23704578816. Its totient is φ = 17778434100.

The previous prime is 20741506417. The next prime is 20741506481. The reversal of 20741506457 is 75460514702.

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 20741506457 - 2²⁸ = 20473071001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20741506417) 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, 1481536169 + ... + 1481536182.

It is an arithmetic number, because the mean of its divisors is an integer number (5926144704).

Almost surely, 2^20741506457 is an apocalyptic number.

It is an amenable number.

20741506457 is a deficient number, since it is larger than the sum of its proper divisors (2963072359).

20741506457 is an equidigital number, since it uses as much as digits as its factorization.

20741506457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2963072358.

The product of its (nonzero) digits is 235200, while the sum is 41.

The spelling of 20741506457 in words is "twenty billion, seven hundred forty-one million, five hundred six thousand, four hundred fifty-seven".