20671542 has 24 divisors (see below), whose sum is σ = 45189144. Its totient is φ = 6828864.

The previous prime is 20671531. The next prime is 20671543. The reversal of 20671542 is 24517602.

It is a tcefrep 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, 3048 + ... + 7115.

It is an arithmetic number, because the mean of its divisors is an integer number (1882881).

Almost surely, 2^20671542 is an apocalyptic number.

20671542 is an abundant number, since it is smaller than the sum of its proper divisors (24517602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20671542 is a wasteful number, since it uses less digits than its factorization.

20671542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10284 (or 10281 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20671542 is about 4546.5967492180. The cubic root of 20671542 is about 274.4464545642.

The spelling of 20671542 in words is "twenty million, six hundred seventy-one thousand, five hundred forty-two".