20671573 has 12 divisors (see below), whose sum is σ = 22626660. Its totient is φ = 18884736.

The previous prime is 20671543. The next prime is 20671603. The reversal of 20671573 is 37517602.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an interprime number because it is at equal distance from previous prime (20671543) and next prime (20671603).

It can be written as a sum of positive squares in 6 ways, for example, as 15186609 + 5484964 = 3897^2 + 2342^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20671573 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 (20671543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 213061 + ... + 213157.

It is an arithmetic number, because the mean of its divisors is an integer number (1885555).

Almost surely, 2^20671573 is an apocalyptic number.

It is an amenable number.

20671573 is a deficient number, since it is larger than the sum of its proper divisors (1955087).

20671573 is an frugal number, since it uses more digits than its factorization.

20671573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 20671573 is about 4546.6001583601. The cubic root of 20671573 is about 274.4465917550.

The spelling of 20671573 in words is "twenty million, six hundred seventy-one thousand, five hundred seventy-three".