20534542111 has 8 divisors (see below), whose sum is σ = 21259148400. Its totient is φ = 19811037120.

The previous prime is 20534542109. The next prime is 20534542157. The reversal of 20534542111 is 11124543502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20534542111 - 2¹ = 20534542109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20534542111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20534542181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237285 + ... + 312046.

It is an arithmetic number, because the mean of its divisors is an integer number (2657393550).

Almost surely, 2^20534542111 is an apocalyptic number.

20534542111 is a deficient number, since it is larger than the sum of its proper divisors (724606289).

20534542111 is a wasteful number, since it uses less digits than its factorization.

20534542111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550649.

The product of its (nonzero) digits is 4800, while the sum is 28.

It can be divided in two parts, 205345 and 42111, that added together give a triangular number (247456 = T₇₀₃).

The spelling of 20534542111 in words is "twenty billion, five hundred thirty-four million, five hundred forty-two thousand, one hundred eleven".