20814577778 has 16 divisors (see below), whose sum is σ = 31323633120. Its totient is φ = 10373390016.

The previous prime is 20814577747. The next prime is 20814577801. The reversal of 20814577778 is 87777541802.

It is a super-2 number, since 2×20814577778² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2961953 + ... + 2968971.

It is an arithmetic number, because the mean of its divisors is an integer number (1957727070).

Almost surely, 2^20814577778 is an apocalyptic number.

20814577778 is a deficient number, since it is larger than the sum of its proper divisors (10509055342).

20814577778 is a wasteful number, since it uses less digits than its factorization.

20814577778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11641.

The product of its (nonzero) digits is 6146560, while the sum is 56.

The spelling of 20814577778 in words is "twenty billion, eight hundred fourteen million, five hundred seventy-seven thousand, seven hundred seventy-eight".