20981549434 has 8 divisors (see below), whose sum is σ = 31480309728. Its totient is φ = 10488112860.

The previous prime is 20981549383. The next prime is 20981549437. The reversal of 20981549434 is 43494518902.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (20981549437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1321062 + ... + 1336849.

It is an arithmetic number, because the mean of its divisors is an integer number (3935038716).

Almost surely, 2^20981549434 is an apocalyptic number.

20981549434 is a deficient number, since it is larger than the sum of its proper divisors (10498760294).

20981549434 is a wasteful number, since it uses less digits than its factorization.

20981549434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661860.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 20981549434 in words is "twenty billion, nine hundred eighty-one million, five hundred forty-nine thousand, four hundred thirty-four".