20014921 has 4 divisors (see below), whose sum is σ = 20289172. Its totient is φ = 19740672.

The previous prime is 20014913. The next prime is 20014949. The reversal of 20014921 is 12941002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14907321 + 5107600 = 3861^2 + 2260^2 .

It is a cyclic number.

It is not a de Polignac number, because 20014921 - 2³ = 20014913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20014021) 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, 137016 + ... + 137161.

It is an arithmetic number, because the mean of its divisors is an integer number (5072293).

Almost surely, 2^20014921 is an apocalyptic number.

It is an amenable number.

20014921 is a deficient number, since it is larger than the sum of its proper divisors (274251).

20014921 is an equidigital number, since it uses as much as digits as its factorization.

20014921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274250.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 20014921 is about 4473.8038624866. The cubic root of 20014921 is about 271.5092479217.

Adding to 20014921 its reverse (12941002), we get a palindrome (32955923).

The spelling of 20014921 in words is "twenty million, fourteen thousand, nine hundred twenty-one".