20432978 has 8 divisors (see below), whose sum is σ = 30683772. Its totient is φ = 10205056.

The previous prime is 20432977. The next prime is 20432981. The reversal of 20432978 is 87923402.

It can be written as a sum of positive squares in 2 ways, for example, as 15737089 + 4695889 = 3967^2 + 2167^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20432977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3275 + ... + 7182.

Almost surely, 2^20432978 is an apocalyptic number.

20432978 is a deficient number, since it is larger than the sum of its proper divisors (10250794).

20432978 is a wasteful number, since it uses less digits than its factorization.

20432978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11436.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20432978 is about 4520.2851679955. The cubic root of 20432978 is about 273.3865991109.

The spelling of 20432978 in words is "twenty million, four hundred thirty-two thousand, nine hundred seventy-eight".