20074778 has 4 divisors (see below), whose sum is σ = 30112170. Its totient is φ = 10037388.

The previous prime is 20074771. The next prime is 20074783. The reversal of 20074778 is 87747002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10936249 + 9138529 = 3307^2 + 3023^2 .

It is not an unprimeable number, because it can be changed into a prime (20074771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5018693 + ... + 5018696.

Almost surely, 2^20074778 is an apocalyptic number.

20074778 is a deficient number, since it is larger than the sum of its proper divisors (10037392).

20074778 is a wasteful number, since it uses less digits than its factorization.

20074778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10037391.

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 20074778 is about 4480.4885894286. The cubic root of 20074778 is about 271.7796387800.

The spelling of 20074778 in words is "twenty million, seventy-four thousand, seven hundred seventy-eight".