20754785519 has 4 divisors (see below), whose sum is σ = 22351307496. Its totient is φ = 19158263544.

The previous prime is 20754785509. The next prime is 20754785567. The reversal of 20754785519 is 91558745702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91558745702 = 2 ⋅45779372851.

It is a cyclic number.

It is not a de Polignac number, because 20754785519 - 2⁴ = 20754785503 is a prime.

It is a super-2 number, since 2×20754785519² (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 (20754785509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 798260969 + ... + 798260994.

It is an arithmetic number, because the mean of its divisors is an integer number (5587826874).

Almost surely, 2^20754785519 is an apocalyptic number.

20754785519 is a deficient number, since it is larger than the sum of its proper divisors (1596521977).

20754785519 is a wasteful number, since it uses less digits than its factorization.

20754785519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596521976.

The product of its (nonzero) digits is 3528000, while the sum is 53.

The spelling of 20754785519 in words is "twenty billion, seven hundred fifty-four million, seven hundred eighty-five thousand, five hundred nineteen".