20214979 has 4 divisors (see below), whose sum is σ = 20350800. Its totient is φ = 20079160.

The previous prime is 20214977. The next prime is 20214983. The reversal of 20214979 is 97941202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97941202 = 2 ⋅48970601.

It is a cyclic number.

It is not a de Polignac number, because 20214979 - 2¹ = 20214977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20214977) 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, 67687 + ... + 67984.

It is an arithmetic number, because the mean of its divisors is an integer number (5087700).

Almost surely, 2^20214979 is an apocalyptic number.

20214979 is a deficient number, since it is larger than the sum of its proper divisors (135821).

20214979 is a wasteful number, since it uses less digits than its factorization.

20214979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135820.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 20214979 is about 4496.1070939203. The cubic root of 20214979 is about 272.4108689222.

The spelling of 20214979 in words is "twenty million, two hundred fourteen thousand, nine hundred seventy-nine".