20440523121 has 32 divisors (see below), whose sum is σ = 29256998400. Its totient is φ = 12648130560.

The previous prime is 20440523113. The next prime is 20440523137. The reversal of 20440523121 is 12132504402.

It is not a de Polignac number, because 20440523121 - 2³ = 20440523113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20440523091 and 20440523100.

It is not an unprimeable number, because it can be changed into a prime (20440523161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4111125 + ... + 4116093.

It is an arithmetic number, because the mean of its divisors is an integer number (914281200).

Almost surely, 2^20440523121 is an apocalyptic number.

It is an amenable number.

20440523121 is a deficient number, since it is larger than the sum of its proper divisors (8816475279).

20440523121 is a wasteful number, since it uses less digits than its factorization.

20440523121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6089.

The product of its (nonzero) digits is 1920, while the sum is 24.

The spelling of 20440523121 in words is "twenty billion, four hundred forty million, five hundred twenty-three thousand, one hundred twenty-one".