20074978 has 32 divisors (see below), whose sum is σ = 38176128. Its totient is φ = 7689600.

The previous prime is 20074973. The next prime is 20074987. The reversal of 20074978 is 87947002.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20074973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8326 + ... + 10462.

It is an arithmetic number, because the mean of its divisors is an integer number (1193004).

Almost surely, 2^20074978 is an apocalyptic number.

20074978 is a deficient number, since it is larger than the sum of its proper divisors (18101150).

20074978 is a wasteful number, since it uses less digits than its factorization.

20074978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 20074978 is about 4480.5109083675. The cubic root of 20074978 is about 271.7805413346.

The spelling of 20074978 in words is "twenty million, seventy-four thousand, nine hundred seventy-eight".