20123405525 has 48 divisors (see below), whose sum is σ = 27364808064. Its totient is φ = 14633498880.

The previous prime is 20123405509. The next prime is 20123405557. The reversal of 20123405525 is 52550432102.

It is not a de Polignac number, because 20123405525 - 2⁴ = 20123405509 is a prime.

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 47 ways as a sum of consecutive naturals, for example, 903827 + ... + 925823.

It is an arithmetic number, because the mean of its divisors is an integer number (570100168).

Almost surely, 2^20123405525 is an apocalyptic number.

20123405525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20123405525 is a deficient number, since it is larger than the sum of its proper divisors (7241402539).

20123405525 is a wasteful number, since it uses less digits than its factorization.

20123405525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22110 (or 22105 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 20123405525 its reverse (52550432102), we get a palindrome (72673837627).

The spelling of 20123405525 in words is "twenty billion, one hundred twenty-three million, four hundred five thousand, five hundred twenty-five".