20515021325 has 24 divisors (see below), whose sum is σ = 25875132576. Its totient is φ = 16130808000.

The previous prime is 20515021301. The next prime is 20515021333. The reversal of 20515021325 is 52312051502.

It is not a de Polignac number, because 20515021325 - 2¹⁶ = 20514955789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20515021294 and 20515021303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2391494 + ... + 2400056.

It is an arithmetic number, because the mean of its divisors is an integer number (1078130524).

Almost surely, 2^20515021325 is an apocalyptic number.

20515021325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20515021325 is a deficient number, since it is larger than the sum of its proper divisors (5360111251).

20515021325 is a wasteful number, since it uses less digits than its factorization.

20515021325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10205 (or 10200 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 20515021325 its reverse (52312051502), we get a palindrome (72827072827).

The spelling of 20515021325 in words is "twenty billion, five hundred fifteen million, twenty-one thousand, three hundred twenty-five".