20400023225 has 24 divisors (see below), whose sum is σ = 25397660160. Its totient is φ = 16254600320.

The previous prime is 20400023221. The next prime is 20400023251. The reversal of 20400023225 is 52232000402.

It is not a de Polignac number, because 20400023225 - 2² = 20400023221 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20400023197 and 20400023206.

It is not an unprimeable number, because it can be changed into a prime (20400023221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7746509 + ... + 7749141.

It is an arithmetic number, because the mean of its divisors is an integer number (1058235840).

Almost surely, 2^20400023225 is an apocalyptic number.

20400023225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20400023225 is a deficient number, since it is larger than the sum of its proper divisors (4997636935).

20400023225 is a wasteful number, since it uses less digits than its factorization.

20400023225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3769 (or 3764 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

Adding to 20400023225 its reverse (52232000402), we get a palindrome (72632023627).

The spelling of 20400023225 in words is "twenty billion, four hundred million, twenty-three thousand, two hundred twenty-five".