20440433121 has 16 divisors (see below), whose sum is σ = 27984952320. Its totient is φ = 13265920080.

The previous prime is 20440433099. The next prime is 20440433137. The reversal of 20440433121 is 12133404402.

It is not a de Polignac number, because 20440433121 - 2⁹ = 20440432609 is a prime.

It is a super-2 number, since 2×20440433121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20440433091 and 20440433100.

It is not an unprimeable number, because it can be changed into a prime (20440433161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 542365 + ... + 578826.

It is an arithmetic number, because the mean of its divisors is an integer number (1749059520).

Almost surely, 2^20440433121 is an apocalyptic number.

It is an amenable number.

20440433121 is a deficient number, since it is larger than the sum of its proper divisors (7544519199).

20440433121 is a wasteful number, since it uses less digits than its factorization.

20440433121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121356.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 20440433121 its reverse (12133404402), we get a palindrome (32573837523).

The spelling of 20440433121 in words is "twenty billion, four hundred forty million, four hundred thirty-three thousand, one hundred twenty-one".