20501521255 has 16 divisors (see below), whose sum is σ = 24678108000. Its totient is φ = 16350421120.

The previous prime is 20501521231. The next prime is 20501521267. The reversal of 20501521255 is 55212510502.

It is not a de Polignac number, because 20501521255 - 2¹³ = 20501513063 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, 4080645 + ... + 4085665.

It is an arithmetic number, because the mean of its divisors is an integer number (1542381750).

Almost surely, 2^20501521255 is an apocalyptic number.

20501521255 is a deficient number, since it is larger than the sum of its proper divisors (4176586745).

20501521255 is a wasteful number, since it uses less digits than its factorization.

20501521255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7394.

The product of its (nonzero) digits is 5000, while the sum is 28.

The spelling of 20501521255 in words is "twenty billion, five hundred one million, five hundred twenty-one thousand, two hundred fifty-five".