20554533139 has 16 divisors (see below), whose sum is σ = 23634533376. Its totient is φ = 17510673600.

The previous prime is 20554533137. The next prime is 20554533143. The reversal of 20554533139 is 93133545502.

It is not a de Polignac number, because 20554533139 - 2¹ = 20554533137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20554533133) 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, 1114854 + ... + 1133140.

It is an arithmetic number, because the mean of its divisors is an integer number (1477158336).

Almost surely, 2^20554533139 is an apocalyptic number.

20554533139 is a deficient number, since it is larger than the sum of its proper divisors (3080000237).

20554533139 is a wasteful number, since it uses less digits than its factorization.

20554533139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19266.

The product of its (nonzero) digits is 243000, while the sum is 40.

The spelling of 20554533139 in words is "twenty billion, five hundred fifty-four million, five hundred thirty-three thousand, one hundred thirty-nine".