20572671 has 8 divisors (see below), whose sum is σ = 31348864. Its totient is φ = 11755800.

The previous prime is 20572663. The next prime is 20572691. The reversal of 20572671 is 17627502.

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

It is not a de Polignac number, because 20572671 - 2³ = 20572663 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 (20572661) 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, 489805 + ... + 489846.

It is an arithmetic number, because the mean of its divisors is an integer number (3918608).

Almost surely, 2^20572671 is an apocalyptic number.

20572671 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20572671 is a deficient number, since it is larger than the sum of its proper divisors (10776193).

20572671 is an equidigital number, since it uses as much as digits as its factorization.

20572671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979661.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 20572671 is about 4535.7106389187. The cubic root of 20572671 is about 274.0082003335.

The spelling of 20572671 in words is "twenty million, five hundred seventy-two thousand, six hundred seventy-one".