20641324534 has 4 divisors (see below), whose sum is σ = 30961986804. Its totient is φ = 10320662266.

The previous prime is 20641324453. The next prime is 20641324547. The reversal of 20641324534 is 43542314602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43542314602 = 2 ⋅21771157301.

It is a self number, because there is not a number n which added to its sum of digits gives 20641324534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5160331132 + ... + 5160331135.

It is an arithmetic number, because the mean of its divisors is an integer number (7740496701).

Almost surely, 2^20641324534 is an apocalyptic number.

20641324534 is a deficient number, since it is larger than the sum of its proper divisors (10320662270).

20641324534 is a wasteful number, since it uses less digits than its factorization.

20641324534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10320662269.

The product of its (nonzero) digits is 69120, while the sum is 34.

The spelling of 20641324534 in words is "twenty billion, six hundred forty-one million, three hundred twenty-four thousand, five hundred thirty-four".