20720950519 has 4 divisors (see below), whose sum is σ = 20722652496. Its totient is φ = 20719248544.

The previous prime is 20720950507. The next prime is 20720950561. The reversal of 20720950519 is 91505902702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91505902702 = 2 ⋅45752951351.

It is a cyclic number.

It is not a de Polignac number, because 20720950519 - 2¹⁵ = 20720917751 is a prime.

It is a super-2 number, since 2×20720950519² (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 (20720950319) 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, 832594 + ... + 857119.

It is an arithmetic number, because the mean of its divisors is an integer number (5180663124).

Almost surely, 2^20720950519 is an apocalyptic number.

20720950519 is a deficient number, since it is larger than the sum of its proper divisors (1701977).

20720950519 is a wasteful number, since it uses less digits than its factorization.

20720950519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701976.

The product of its (nonzero) digits is 56700, while the sum is 40.

The spelling of 20720950519 in words is "twenty billion, seven hundred twenty million, nine hundred fifty thousand, five hundred nineteen".