20741978 has 8 divisors (see below), whose sum is σ = 31953972. Its totient is φ = 10090656.

The previous prime is 20741947. The next prime is 20742017. The reversal of 20741978 is 87914702.

It can be written as a sum of positive squares in 2 ways, for example, as 20584369 + 157609 = 4537^2 + 397^2 .

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

It is a Curzon number.

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, 140075 + ... + 140222.

Almost surely, 2^20741978 is an apocalyptic number.

20741978 is a deficient number, since it is larger than the sum of its proper divisors (11211994).

20741978 is a wasteful number, since it uses less digits than its factorization.

20741978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280336.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 20741978 is about 4554.3361755584. The cubic root of 20741978 is about 274.7578165316.

The spelling of 20741978 in words is "twenty million, seven hundred forty-one thousand, nine hundred seventy-eight".