20257255921919 has 32 divisors (see below), whose sum is σ = 21354911539200. Its totient is φ = 19191350505600.

The previous prime is 20257255921867. The next prime is 20257255921933. The reversal of 20257255921919 is 91912955275202.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20257255921919 is a prime.

It is a super-2 number, since 2×20257255921919² (a number of 27 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 (20257255921999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1135678469 + ... + 1135696305.

It is an arithmetic number, because the mean of its divisors is an integer number (667340985600).

Almost surely, 2^{20257255921919} is an apocalyptic number.

20257255921919 is a deficient number, since it is larger than the sum of its proper divisors (1097655617281).

20257255921919 is a wasteful number, since it uses less digits than its factorization.

20257255921919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21551.

The product of its (nonzero) digits is 10206000, while the sum is 59.

The spelling of 20257255921919 in words is "twenty trillion, two hundred fifty-seven billion, two hundred fifty-five million, nine hundred twenty-one thousand, nine hundred nineteen".