20011531255 has 4 divisors (see below), whose sum is σ = 24013837512. Its totient is φ = 16009225000.

The previous prime is 20011531157. The next prime is 20011531279. The reversal of 20011531255 is 55213511002.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20011531255 - 2¹¹ = 20011529207 is a prime.

It is a super-2 number, since 2×20011531255² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2001153121 + ... + 2001153130.

It is an arithmetic number, because the mean of its divisors is an integer number (6003459378).

Almost surely, 2^20011531255 is an apocalyptic number.

20011531255 is a deficient number, since it is larger than the sum of its proper divisors (4002306257).

20011531255 is an equidigital number, since it uses as much as digits as its factorization.

20011531255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4002306256.

The product of its (nonzero) digits is 1500, while the sum is 25.

The spelling of 20011531255 in words is "twenty billion, eleven million, five hundred thirty-one thousand, two hundred fifty-five".