20409551044 has 27 divisors (see below), whose sum is σ = 36342868653. Its totient is φ = 10028912400.

The previous prime is 20409551039. The next prime is 20409551047. The reversal of 20409551044 is 44015590402.

The square root of 20409551044 is 142862.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 663680644 + 19745870400 = 25762^2 + 140520^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20409551047) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17428579 + ... + 17429749.

Almost surely, 2^20409551044 is an apocalyptic number.

20409551044 is the 142862-nd square number.

It is an amenable number.

20409551044 is a deficient number, since it is larger than the sum of its proper divisors (15933317609).

20409551044 is an frugal number, since it uses more digits than its factorization.

20409551044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 20409551044 in words is "twenty billion, four hundred nine million, five hundred fifty-one thousand, forty-four".