20544622557 has 16 divisors (see below), whose sum is σ = 28599989760. Its totient is φ = 13093508912.

The previous prime is 20544622523. The next prime is 20544622583. The reversal of 20544622557 is 75522644502.

It is a cyclic number.

It is not a de Polignac number, because 20544622557 - 2¹⁵ = 20544589789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20544623557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39994 + ... + 206612.

It is an arithmetic number, because the mean of its divisors is an integer number (1787499360).

Almost surely, 2^20544622557 is an apocalyptic number.

It is an amenable number.

20544622557 is a deficient number, since it is larger than the sum of its proper divisors (8055367203).

20544622557 is a wasteful number, since it uses less digits than its factorization.

20544622557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168432.

The product of its (nonzero) digits is 672000, while the sum is 42.

The spelling of 20544622557 in words is "twenty billion, five hundred forty-four million, six hundred twenty-two thousand, five hundred fifty-seven".