20545401731 has 4 divisors (see below), whose sum is σ = 21753954792. Its totient is φ = 19336848672.

The previous prime is 20545401703. The next prime is 20545401739. The reversal of 20545401731 is 13710454502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20545401731 - 2¹⁴ = 20545385347 is a prime.

It is a super-2 number, since 2×20545401731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20545401739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 604276505 + ... + 604276538.

It is an arithmetic number, because the mean of its divisors is an integer number (5438488698).

Almost surely, 2^20545401731 is an apocalyptic number.

20545401731 is a deficient number, since it is larger than the sum of its proper divisors (1208553061).

20545401731 is a wasteful number, since it uses less digits than its factorization.

20545401731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208553060.

The product of its (nonzero) digits is 16800, while the sum is 32.

The spelling of 20545401731 in words is "twenty billion, five hundred forty-five million, four hundred one thousand, seven hundred thirty-one".