20460778 has 16 divisors (see below), whose sum is σ = 33946920. Its totient is φ = 9187776.

The previous prime is 20460773. The next prime is 20460779. The reversal of 20460778 is 87706402.

It can be written as a sum of positive squares in 4 ways, for example, as 18464209 + 1996569 = 4297^2 + 1413^2 .

It is not an unprimeable number, because it can be changed into a prime (20460773) 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, 9673 + ... + 11596.

Almost surely, 2^20460778 is an apocalyptic number.

20460778 is a deficient number, since it is larger than the sum of its proper divisors (13486142).

20460778 is a wasteful number, since it uses less digits than its factorization.

20460778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21321.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 20460778 is about 4523.3591500123. The cubic root of 20460778 is about 273.5105279100.

The spelling of 20460778 in words is "twenty million, four hundred sixty thousand, seven hundred seventy-eight".