20578431 has 8 divisors (see below), whose sum is σ = 27620224. Its totient is φ = 13627800.

The previous prime is 20578421. The next prime is 20578457. The reversal of 20578431 is 13487502.

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

It is not a de Polignac number, because 20578431 - 2⁶ = 20578367 is a prime.

It is a super-2 number, since 2×20578431² = 846943644843522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20578421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22261 + ... + 23166.

It is an arithmetic number, because the mean of its divisors is an integer number (3452528).

Almost surely, 2^20578431 is an apocalyptic number.

20578431 is a deficient number, since it is larger than the sum of its proper divisors (7041793).

20578431 is a wasteful number, since it uses less digits than its factorization.

20578431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45581.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 20578431 is about 4536.3455556207. The cubic root of 20578431 is about 274.0337705015.

The spelling of 20578431 in words is "twenty million, five hundred seventy-eight thousand, four hundred thirty-one".