20531050993 has 8 divisors (see below), whose sum is σ = 21438690048. Its totient is φ = 19624660704.

The previous prime is 20531050987. The next prime is 20531051059. The reversal of 20531050993 is 39905013502.

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

It is a cyclic number.

It is not a de Polignac number, because 20531050993 - 2⁵ = 20531050961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20531000993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278505 + ... + 344422.

It is an arithmetic number, because the mean of its divisors is an integer number (2679836256).

Almost surely, 2^20531050993 is an apocalyptic number.

20531050993 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20531050993 is a deficient number, since it is larger than the sum of its proper divisors (907639055).

20531050993 is a wasteful number, since it uses less digits than its factorization.

20531050993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624383.

The product of its (nonzero) digits is 36450, while the sum is 37.

The spelling of 20531050993 in words is "twenty billion, five hundred thirty-one million, fifty thousand, nine hundred ninety-three".