20643642430 has 8 divisors (see below), whose sum is σ = 37158556392. Its totient is φ = 8257456968.

The previous prime is 20643642421. The next prime is 20643642451. The reversal of 20643642430 is 3424634602.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1032182112 + ... + 1032182131.

It is an arithmetic number, because the mean of its divisors is an integer number (4644819549).

Almost surely, 2^20643642430 is an apocalyptic number.

20643642430 is a deficient number, since it is larger than the sum of its proper divisors (16514913962).

20643642430 is a wasteful number, since it uses less digits than its factorization.

20643642430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064364250.

The product of its (nonzero) digits is 82944, while the sum is 34.

The spelling of 20643642430 in words is "twenty billion, six hundred forty-three million, six hundred forty-two thousand, four hundred thirty".