20802765619 has 8 divisors (see below), whose sum is σ = 21905187840. Its totient is φ = 19701097416.

The previous prime is 20802765617. The next prime is 20802765631. The reversal of 20802765619 is 91656720802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20802765619 - 2¹ = 20802765617 is a prime.

It is a super-2 number, since 2×20802765619² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20802765617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131419 + ... + 242644.

It is an arithmetic number, because the mean of its divisors is an integer number (2738148480).

Almost surely, 2^20802765619 is an apocalyptic number.

20802765619 is a deficient number, since it is larger than the sum of its proper divisors (1102422221).

20802765619 is a wasteful number, since it uses less digits than its factorization.

20802765619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377009.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 20802765619 in words is "twenty billion, eight hundred two million, seven hundred sixty-five thousand, six hundred nineteen".