20437546819 has 2 divisors, whose sum is σ = 20437546820. Its totient is φ = 20437546818.

The previous prime is 20437546807. The next prime is 20437546837. The reversal of 20437546819 is 91864573402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20437546819 - 2⁹ = 20437546307 is a prime.

It is a super-2 number, since 2×20437546819² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20437546879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10218773409 + 10218773410.

It is an arithmetic number, because the mean of its divisors is an integer number (10218773410).

It is a 1-persistent number, because it is pandigital, but 2⋅20437546819 = 40875093638 is not.

Almost surely, 2^20437546819 is an apocalyptic number.

20437546819 is a deficient number, since it is larger than the sum of its proper divisors (1).

20437546819 is an equidigital number, since it uses as much as digits as its factorization.

20437546819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 20437546819 in words is "twenty billion, four hundred thirty-seven million, five hundred forty-six thousand, eight hundred nineteen".