20230978 has 4 divisors (see below), whose sum is σ = 30346470. Its totient is φ = 10115488.

The previous prime is 20230967. The next prime is 20230981. The reversal of 20230978 is 87903202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87903202 = 2 ⋅43951601.

It can be written as a sum of positive squares in only one way, i.e., 14722569 + 5508409 = 3837^2 + 2347^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5057743 + ... + 5057746.

Almost surely, 2^20230978 is an apocalyptic number.

20230978 is a deficient number, since it is larger than the sum of its proper divisors (10115492).

20230978 is a wasteful number, since it uses less digits than its factorization.

20230978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10115491.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20230978 is about 4497.8859478648. The cubic root of 20230978 is about 272.4827158467.

The spelling of 20230978 in words is "twenty million, two hundred thirty thousand, nine hundred seventy-eight".