20878466779869 has 8 divisors (see below), whose sum is σ = 27844488921312. Its totient is φ = 13915711245840.

The previous prime is 20878466779861. The next prime is 20878466779897. The reversal of 20878466779869 is 96897766487802.

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

It is not a de Polignac number, because 20878466779869 - 2³ = 20878466779861 is a prime.

It is a super-2 number, since 2×20878466779869² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20878466779861) 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, 816636939 + ... + 816662504.

It is an arithmetic number, because the mean of its divisors is an integer number (3480561115164).

Almost surely, 2^{20878466779869} is an apocalyptic number.

It is an amenable number.

20878466779869 is a deficient number, since it is larger than the sum of its proper divisors (6966022141443).

20878466779869 is a wasteful number, since it uses less digits than its factorization.

20878466779869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633303707.

The product of its (nonzero) digits is 24580620288, while the sum is 87.

The spelling of 20878466779869 in words is "twenty trillion, eight hundred seventy-eight billion, four hundred sixty-six million, seven hundred seventy-nine thousand, eight hundred sixty-nine".