20434778 has 16 divisors (see below), whose sum is σ = 37726080. Its totient is φ = 8084016.

The previous prime is 20434759. The next prime is 20434789. The reversal of 20434778 is 87743402.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 55958 + ... + 56321.

It is an arithmetic number, because the mean of its divisors is an integer number (2357880).

Almost surely, 2^20434778 is an apocalyptic number.

20434778 is a deficient number, since it is larger than the sum of its proper divisors (17291302).

20434778 is a wasteful number, since it uses less digits than its factorization.

20434778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112301.

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 20434778 is about 4520.4842660936. The cubic root of 20434778 is about 273.3946266800.

It can be divided in two parts, 20434 and 778, that added together give a palindrome (21212).

The spelling of 20434778 in words is "twenty million, four hundred thirty-four thousand, seven hundred seventy-eight".