20354621357 has 8 divisors (see below), whose sum is σ = 23288836032. Its totient is φ = 17427009600.

The previous prime is 20354621333. The next prime is 20354621369. The reversal of 20354621357 is 75312645302.

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

It is not a de Polignac number, because 20354621357 - 2³⁴ = 3174752173 is a prime.

It is a super-2 number, since 2×20354621357² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20354621357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20354621657) 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, 1644119 + ... + 1656452.

It is an arithmetic number, because the mean of its divisors is an integer number (2911104504).

Almost surely, 2^20354621357 is an apocalyptic number.

It is an amenable number.

20354621357 is a deficient number, since it is larger than the sum of its proper divisors (2934214675).

20354621357 is an equidigital number, since it uses as much as digits as its factorization.

20354621357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301459.

The product of its (nonzero) digits is 151200, while the sum is 38.

The spelling of 20354621357 in words is "twenty billion, three hundred fifty-four million, six hundred twenty-one thousand, three hundred fifty-seven".