20080209437 has 4 divisors (see below), whose sum is σ = 20080635996. Its totient is φ = 20079782880.

The previous prime is 20080209427. The next prime is 20080209467. The reversal of 20080209437 is 73490208002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73490208002 = 2 ⋅36745104001.

It can be written as a sum of positive squares in 2 ways, for example, as 6721704196 + 13358505241 = 81986^2 + 115579^2 .

It is a cyclic number.

It is not a de Polignac number, because 20080209437 - 2²⁸ = 19811773981 is a prime.

It is a super-2 number, since 2×20080209437² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20080209397 and 20080209406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20080209427) 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, 132458 + ... + 240219.

It is an arithmetic number, because the mean of its divisors is an integer number (5020158999).

Almost surely, 2^20080209437 is an apocalyptic number.

It is an amenable number.

20080209437 is a deficient number, since it is larger than the sum of its proper divisors (426559).

20080209437 is an equidigital number, since it uses as much as digits as its factorization.

20080209437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426558.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 20080209437 in words is "twenty billion, eighty million, two hundred nine thousand, four hundred thirty-seven".