20115253555 has 16 divisors (see below), whose sum is σ = 24900218784. Its totient is φ = 15592135680.

The previous prime is 20115253549. The next prime is 20115253579. The reversal of 20115253555 is 55535251102.

It is a de Polignac number, because none of the positive numbers 2^k-20115253555 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20115253555.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 471742 + ... + 512611.

It is an arithmetic number, because the mean of its divisors is an integer number (1556263674).

Almost surely, 2^20115253555 is an apocalyptic number.

20115253555 is a deficient number, since it is larger than the sum of its proper divisors (4784965229).

20115253555 is an equidigital number, since it uses as much as digits as its factorization.

20115253555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984486.

The product of its (nonzero) digits is 37500, while the sum is 34.

The spelling of 20115253555 in words is "twenty billion, one hundred fifteen million, two hundred fifty-three thousand, five hundred fifty-five".