20570421 has 8 divisors (see below), whose sum is σ = 27525280. Its totient is φ = 13664592.

The previous prime is 20570419. The next prime is 20570423. The reversal of 20570421 is 12407502.

It is an interprime number because it is at equal distance from previous prime (20570419) and next prime (20570423).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20570421 - 2¹ = 20570419 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 (20570423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11266 + ... + 12963.

It is an arithmetic number, because the mean of its divisors is an integer number (3440660).

Almost surely, 2^20570421 is an apocalyptic number.

It is an amenable number.

20570421 is a deficient number, since it is larger than the sum of its proper divisors (6954859).

20570421 is a wasteful number, since it uses less digits than its factorization.

20570421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24515.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20570421 is about 4535.4626004411. The cubic root of 20570421 is about 273.9982106904.

Adding to 20570421 its reverse (12407502), we get a palindrome (32977923).

The spelling of 20570421 in words is "twenty million, five hundred seventy thousand, four hundred twenty-one".