20561677534 has 8 divisors (see below), whose sum is σ = 30965395608. Its totient is φ = 10239879000.

The previous prime is 20561677523. The next prime is 20561677559. The reversal of 20561677534 is 43577616502.

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

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, 20479257 + ... + 20480260.

It is an arithmetic number, because the mean of its divisors is an integer number (3870674451).

Almost surely, 2^20561677534 is an apocalyptic number.

20561677534 is a deficient number, since it is larger than the sum of its proper divisors (10403718074).

20561677534 is a wasteful number, since it uses less digits than its factorization.

20561677534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40959770.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 20561677534 in words is "twenty billion, five hundred sixty-one million, six hundred seventy-seven thousand, five hundred thirty-four".