20021502255 has 16 divisors (see below), whose sum is σ = 32156213760. Its totient is φ = 10637531168.

The previous prime is 20021502209. The next prime is 20021502269. The reversal of 20021502255 is 55220512002.

It is a cyclic number.

It is not a de Polignac number, because 20021502255 - 2¹⁵ = 20021469487 is a prime.

It is a congruent number.

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, 2533635 + ... + 2541524.

It is an arithmetic number, because the mean of its divisors is an integer number (2009763360).

Almost surely, 2^20021502255 is an apocalyptic number.

20021502255 is a deficient number, since it is larger than the sum of its proper divisors (12134711505).

20021502255 is a wasteful number, since it uses less digits than its factorization.

20021502255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5075430.

The product of its (nonzero) digits is 2000, while the sum is 24.

The spelling of 20021502255 in words is "twenty billion, twenty-one million, five hundred two thousand, two hundred fifty-five".