20660437 has 4 divisors (see below), whose sum is σ = 23611936. Its totient is φ = 17708940.

The previous prime is 20660399. The next prime is 20660473. The reversal of 20660437 is 73406602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73406602 = 2 ⋅36703301.

It is a cyclic number.

It is not a de Polignac number, because 20660437 - 2¹⁵ = 20627669 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 (20660137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1475739 + ... + 1475752.

It is an arithmetic number, because the mean of its divisors is an integer number (5902984).

Almost surely, 2^20660437 is an apocalyptic number.

It is an amenable number.

20660437 is a deficient number, since it is larger than the sum of its proper divisors (2951499).

20660437 is an equidigital number, since it uses as much as digits as its factorization.

20660437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2951498.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 20660437 is about 4545.3753420372. The cubic root of 20660437 is about 274.3973004534.

The spelling of 20660437 in words is "twenty million, six hundred sixty thousand, four hundred thirty-seven".