20430978 has 8 divisors (see below), whose sum is σ = 40861968. Its totient is φ = 6810324.

The previous prime is 20430973. The next prime is 20430983. The reversal of 20430978 is 87903402.

It is an interprime number because it is at equal distance from previous prime (20430973) and next prime (20430983).

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

20430978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20430973) 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, 1702576 + ... + 1702587.

It is an arithmetic number, because the mean of its divisors is an integer number (5107746).

Almost surely, 2^20430978 is an apocalyptic number.

20430978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20430978 is a wasteful number, since it uses less digits than its factorization.

20430978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3405168.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20430978 is about 4520.0639376009. The cubic root of 20430978 is about 273.3776790367.

The spelling of 20430978 in words is "twenty million, four hundred thirty thousand, nine hundred seventy-eight".