20542530646 has 32 divisors (see below), whose sum is σ = 33828734880. Its totient is φ = 9278323200.

The previous prime is 20542530611. The next prime is 20542530677. The reversal of 20542530646 is 64603524502.

It is a congruent 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, 2721790 + ... + 2729326.

It is an arithmetic number, because the mean of its divisors is an integer number (1057147965).

Almost surely, 2^20542530646 is an apocalyptic number.

20542530646 is a deficient number, since it is larger than the sum of its proper divisors (13286204234).

20542530646 is a wasteful number, since it uses less digits than its factorization.

20542530646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8320.

The product of its (nonzero) digits is 172800, while the sum is 37.

The spelling of 20542530646 in words is "twenty billion, five hundred forty-two million, five hundred thirty thousand, six hundred forty-six".