20671437 has 16 divisors (see below), whose sum is σ = 28242432. Its totient is φ = 13445040.

The previous prime is 20671423. The next prime is 20671471. The reversal of 20671437 is 73417602.

It is not a de Polignac number, because 20671437 - 2¹⁵ = 20638669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20671477) 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, 22338 + ... + 23244.

It is an arithmetic number, because the mean of its divisors is an integer number (1765152).

Almost surely, 2^20671437 is an apocalyptic number.

It is an amenable number.

20671437 is a deficient number, since it is larger than the sum of its proper divisors (7570995).

20671437 is a wasteful number, since it uses less digits than its factorization.

20671437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 20671437 is about 4546.5852021050. The cubic root of 20671437 is about 274.4459898847.

The spelling of 20671437 in words is "twenty million, six hundred seventy-one thousand, four hundred thirty-seven".