20003855537 has 2 divisors, whose sum is σ = 20003855538. Its totient is φ = 20003855536.

The previous prime is 20003855483. The next prime is 20003855551. The reversal of 20003855537 is 73555830002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11882962081 + 8120893456 = 109009^2 + 90116^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003855537 - 2²⁶ = 19936746673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20003855537.

It is not a weakly prime, because it can be changed into another prime (20003854537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001927768 + 10001927769.

It is an arithmetic number, because the mean of its divisors is an integer number (10001927769).

Almost surely, 2^20003855537 is an apocalyptic number.

It is an amenable number.

20003855537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003855537 is an equidigital number, since it uses as much as digits as its factorization.

20003855537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 38.

The spelling of 20003855537 in words is "twenty billion, three million, eight hundred fifty-five thousand, five hundred thirty-seven".