20945749534 has 8 divisors (see below), whose sum is σ = 31474431720. Its totient is φ = 10454272296.

The previous prime is 20945749471. The next prime is 20945749603. The reversal of 20945749534 is 43594754902.

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

It is a super-2 number, since 2×20945749534² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 9299829 + ... + 9302080.

It is an arithmetic number, because the mean of its divisors is an integer number (3934303965).

Almost surely, 2^20945749534 is an apocalyptic number.

20945749534 is a deficient number, since it is larger than the sum of its proper divisors (10528682186).

20945749534 is a wasteful number, since it uses less digits than its factorization.

20945749534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18602474.

The product of its (nonzero) digits is 5443200, while the sum is 52.

The spelling of 20945749534 in words is "twenty billion, nine hundred forty-five million, seven hundred forty-nine thousand, five hundred thirty-four".