20120500778 has 16 divisors (see below), whose sum is σ = 34567773504. Its totient is φ = 8604200160.

The previous prime is 20120500747. The next prime is 20120500831. The reversal of 20120500778 is 87700502102.

It is a Curzon number.

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, 1566008 + ... + 1578803.

It is an arithmetic number, because the mean of its divisors is an integer number (2160485844).

Almost surely, 2^20120500778 is an apocalyptic number.

20120500778 is a deficient number, since it is larger than the sum of its proper divisors (14447272726).

20120500778 is a wasteful number, since it uses less digits than its factorization.

20120500778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3145277.

The product of its (nonzero) digits is 7840, while the sum is 32.

The spelling of 20120500778 in words is "twenty billion, one hundred twenty million, five hundred thousand, seven hundred seventy-eight".