20878276656046 has 4 divisors (see below), whose sum is σ = 31317414984072. Its totient is φ = 10439138328022.

The previous prime is 20878276656043. The next prime is 20878276656059. The reversal of 20878276656046 is 64065667287802.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20878276656046² (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 (20878276656043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5219569164010 + ... + 5219569164013.

It is an arithmetic number, because the mean of its divisors is an integer number (7829353746018).

Almost surely, 2^{20878276656046} is an apocalyptic number.

20878276656046 is a deficient number, since it is larger than the sum of its proper divisors (10439138328026).

20878276656046 is a wasteful number, since it uses less digits than its factorization.

20878276656046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10439138328025.

The product of its (nonzero) digits is 325140480, while the sum is 67.

The spelling of 20878276656046 in words is "twenty trillion, eight hundred seventy-eight billion, two hundred seventy-six million, six hundred fifty-six thousand, forty-six".