20511123325 has 48 divisors (see below), whose sum is σ = 31764216960. Its totient is φ = 12764160000.

The previous prime is 20511123319. The next prime is 20511123337. The reversal of 20511123325 is 52332111502.

It is not a de Polignac number, because 20511123325 - 2³ = 20511123317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 20511123325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1148061 + ... + 1165789.

It is an arithmetic number, because the mean of its divisors is an integer number (661754520).

Almost surely, 2^20511123325 is an apocalyptic number.

20511123325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20511123325 is a deficient number, since it is larger than the sum of its proper divisors (11253093635).

20511123325 is a wasteful number, since it uses less digits than its factorization.

20511123325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18358 (or 18353 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 20511123325 its reverse (52332111502), we get a palindrome (72843234827).

The spelling of 20511123325 in words is "twenty billion, five hundred eleven million, one hundred twenty-three thousand, three hundred twenty-five".