20621203634 has 8 divisors (see below), whose sum is σ = 31456073520. Its totient is φ = 10135845796.

The previous prime is 20621203621. The next prime is 20621203639. The reversal of 20621203634 is 43630212602.

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

It is a junction number, because it is equal to n+sod(n) for n = 20621203597 and 20621203606.

It is not an unprimeable number, because it can be changed into a prime (20621203639) 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, 87377864 + ... + 87378099.

It is an arithmetic number, because the mean of its divisors is an integer number (3932009190).

Almost surely, 2^20621203634 is an apocalyptic number.

20621203634 is a deficient number, since it is larger than the sum of its proper divisors (10834869886).

20621203634 is a wasteful number, since it uses less digits than its factorization.

20621203634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174756024.

The product of its (nonzero) digits is 10368, while the sum is 29.

The spelling of 20621203634 in words is "twenty billion, six hundred twenty-one million, two hundred three thousand, six hundred thirty-four".