20064421 has 4 divisors (see below), whose sum is σ = 21607852. Its totient is φ = 18520992.

The previous prime is 20064413. The next prime is 20064431. The reversal of 20064421 is 12446002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12446002 = 2 ⋅6223001.

It can be written as a sum of positive squares in 2 ways, for example, as 3944196 + 16120225 = 1986^2 + 4015^2 .

It is a cyclic number.

It is not a de Polignac number, because 20064421 - 2³ = 20064413 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 (20064431) 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, 771696 + ... + 771721.

It is an arithmetic number, because the mean of its divisors is an integer number (5401963).

Almost surely, 2^20064421 is an apocalyptic number.

It is an amenable number.

20064421 is a deficient number, since it is larger than the sum of its proper divisors (1543431).

20064421 is a wasteful number, since it uses less digits than its factorization.

20064421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543430.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20064421 is about 4479.3326511881. The cubic root of 20064421 is about 271.7328917968.

The spelling of 20064421 in words is "twenty million, sixty-four thousand, four hundred twenty-one".