20551023545 has 16 divisors (see below), whose sum is σ = 26793284112. Its totient is φ = 15041832960.

The previous prime is 20551023539. The next prime is 20551023589. The reversal of 20551023545 is 54532015502.

It can be written as a sum of positive squares in 8 ways, for example, as 8495861929 + 12055161616 = 92173^2 + 109796^2 .

It is not a de Polignac number, because 20551023545 - 2⁶ = 20551023481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1391636 + ... + 1406325.

It is an arithmetic number, because the mean of its divisors is an integer number (1674580257).

Almost surely, 2^20551023545 is an apocalyptic number.

It is an amenable number.

20551023545 is a deficient number, since it is larger than the sum of its proper divisors (6242260567).

20551023545 is a wasteful number, since it uses less digits than its factorization.

20551023545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798092.

The product of its (nonzero) digits is 30000, while the sum is 32.

The spelling of 20551023545 in words is "twenty billion, five hundred fifty-one million, twenty-three thousand, five hundred forty-five".