20078978 has 8 divisors (see below), whose sum is σ = 30400272. Its totient is φ = 9945556.

The previous prime is 20078969. The next prime is 20078987. The reversal of 20078978 is 87987002.

It is an interprime number because it is at equal distance from previous prime (20078969) and next prime (20078987).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46700 + ... + 47127.

It is an arithmetic number, because the mean of its divisors is an integer number (3800034).

Almost surely, 2^20078978 is an apocalyptic number.

20078978 is a deficient number, since it is larger than the sum of its proper divisors (10321294).

20078978 is a wasteful number, since it uses less digits than its factorization.

20078978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93936.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 20078978 is about 4480.9572637998. The cubic root of 20078978 is about 271.7985911670.

The spelling of 20078978 in words is "twenty million, seventy-eight thousand, nine hundred seventy-eight".