20537447 has 16 divisors (see below), whose sum is σ = 24121152. Its totient is φ = 17122560.

The previous prime is 20537431. The next prime is 20537471. The reversal of 20537447 is 74473502.

It is not a de Polignac number, because 20537447 - 2⁴ = 20537431 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 (20537497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72947 + ... + 73227.

It is an arithmetic number, because the mean of its divisors is an integer number (1507572).

Almost surely, 2^20537447 is an apocalyptic number.

20537447 is a deficient number, since it is larger than the sum of its proper divisors (3583705).

20537447 is a wasteful number, since it uses less digits than its factorization.

20537447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538.

The product of its (nonzero) digits is 23520, while the sum is 32.

The square root of 20537447 is about 4531.8260116646. The cubic root of 20537447 is about 273.8517277242.

The spelling of 20537447 in words is "twenty million, five hundred thirty-seven thousand, four hundred forty-seven".