20664153623 has 8 divisors (see below), whose sum is σ = 21064263408. Its totient is φ = 20264422464.

The previous prime is 20664153613. The next prime is 20664153673. The reversal of 20664153623 is 32635146602.

It is a happy number.

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 20664153623 - 2²⁶ = 20597044759 is a prime.

It is a super-2 number, since 2×20664153623² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664153613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16811 + ... + 203987.

It is an arithmetic number, because the mean of its divisors is an integer number (2633032926).

Almost surely, 2^20664153623 is an apocalyptic number.

20664153623 is a deficient number, since it is larger than the sum of its proper divisors (400109785).

20664153623 is a wasteful number, since it uses less digits than its factorization.

20664153623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189313.

The product of its (nonzero) digits is 155520, while the sum is 38.

The spelling of 20664153623 in words is "twenty billion, six hundred sixty-four million, one hundred fifty-three thousand, six hundred twenty-three".