20125223515 has 16 divisors (see below), whose sum is σ = 24789359232. Its totient is φ = 15677597824.

The previous prime is 20125223513. The next prime is 20125223549. The reversal of 20125223515 is 51532252102.

It is a cyclic number.

It is not a de Polignac number, because 20125223515 - 2¹ = 20125223513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20125223513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171064 + ... + 263653.

It is an arithmetic number, because the mean of its divisors is an integer number (1549334952).

Almost surely, 2^20125223515 is an apocalyptic number.

20125223515 is a deficient number, since it is larger than the sum of its proper divisors (4664135717).

20125223515 is a wasteful number, since it uses less digits than its factorization.

20125223515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434966.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 20125223515 its reverse (51532252102), we get a palindrome (71657475617).

The spelling of 20125223515 in words is "twenty billion, one hundred twenty-five million, two hundred twenty-three thousand, five hundred fifteen".