20978063 has 4 divisors (see below), whose sum is σ = 21027168. Its totient is φ = 20928960.

The previous prime is 20978021. The next prime is 20978077. The reversal of 20978063 is 36087902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20978063 - 2¹⁶ = 20912527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20978863) 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, 23906 + ... + 24767.

It is an arithmetic number, because the mean of its divisors is an integer number (5256792).

Almost surely, 2^20978063 is an apocalyptic number.

20978063 is a deficient number, since it is larger than the sum of its proper divisors (49105).

20978063 is an equidigital number, since it uses as much as digits as its factorization.

20978063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49104.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20978063 is about 4580.1815466202. The cubic root of 20978063 is about 275.7963166759.

The spelling of 20978063 in words is "twenty million, nine hundred seventy-eight thousand, sixty-three".