20539437 has 16 divisors (see below), whose sum is σ = 30082560. Its totient is φ = 12407472.

The previous prime is 20539433. The next prime is 20539481. The reversal of 20539437 is 73493502.

It is a happy number.

It is not a de Polignac number, because 20539437 - 2² = 20539433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20539398 and 20539407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20539433) 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, 6523 + ... + 9144.

It is an arithmetic number, because the mean of its divisors is an integer number (1880160).

Almost surely, 2^20539437 is an apocalyptic number.

It is an amenable number.

20539437 is a deficient number, since it is larger than the sum of its proper divisors (9543123).

20539437 is a wasteful number, since it uses less digits than its factorization.

20539437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15712.

The product of its (nonzero) digits is 22680, while the sum is 33.

The square root of 20539437 is about 4532.0455646430. The cubic root of 20539437 is about 273.8605724999.

The spelling of 20539437 in words is "twenty million, five hundred thirty-nine thousand, four hundred thirty-seven".