20949297793057 has 4 divisors (see below), whose sum is σ = 20949709688496. Its totient is φ = 20948885897620.

The previous prime is 20949297793051. The next prime is 20949297793069. The reversal of 20949297793057 is 75039779294902.

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-20949297793057 is a prime.

It is a super-3 number, since 3×20949297793057³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20949297793051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205871419 + ... + 205973152.

It is an arithmetic number, because the mean of its divisors is an integer number (5237427422124).

Almost surely, 2^{20949297793057} is an apocalyptic number.

It is an amenable number.

20949297793057 is a deficient number, since it is larger than the sum of its proper divisors (411895439).

20949297793057 is an equidigital number, since it uses as much as digits as its factorization.

20949297793057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411895438.

The product of its (nonzero) digits is 540101520, while the sum is 73.

The spelling of 20949297793057 in words is "twenty trillion, nine hundred forty-nine billion, two hundred ninety-seven million, seven hundred ninety-three thousand, fifty-seven".