20887305778 has 8 divisors (see below), whose sum is σ = 31337166960. Its totient is φ = 10441583460.

The previous prime is 20887305763. The next prime is 20887305827. The reversal of 20887305778 is 87750378802.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1022068 + ... + 1042303.

It is an arithmetic number, because the mean of its divisors is an integer number (3917145870).

Almost surely, 2^20887305778 is an apocalyptic number.

20887305778 is a deficient number, since it is larger than the sum of its proper divisors (10449861182).

20887305778 is a wasteful number, since it uses less digits than its factorization.

20887305778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069432.

The product of its (nonzero) digits is 5268480, while the sum is 55.

The spelling of 20887305778 in words is "twenty billion, eight hundred eighty-seven million, three hundred five thousand, seven hundred seventy-eight".