20671536 has 40 divisors (see below), whose sum is σ = 53837824. Its totient is φ = 6834240.

The previous prime is 20671531. The next prime is 20671543. The reversal of 20671536 is 63517602.

It is not an unprimeable number, because it can be changed into a prime (20671531) 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, 4401 + ... + 7791.

Almost surely, 2^20671536 is an apocalyptic number.

It is an amenable number.

20671536 is an abundant number, since it is smaller than the sum of its proper divisors (33166288).

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

20671536 is a wasteful number, since it uses less digits than its factorization.

20671536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529 (or 3523 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20671536 is about 4546.5960893838. The cubic root of 20671536 is about 274.4464280112.

The spelling of 20671536 in words is "twenty million, six hundred seventy-one thousand, five hundred thirty-six".