20453632999 has 4 divisors (see below), whose sum is σ = 20788938520. Its totient is φ = 20118327480.

The previous prime is 20453632987. The next prime is 20453633017. The reversal of 20453632999 is 99923635402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20453632999 - 2¹⁵ = 20453600231 is a prime.

It is a super-2 number, since 2×20453632999² (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 (20453632949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167652669 + ... + 167652790.

It is an arithmetic number, because the mean of its divisors is an integer number (5197234630).

Almost surely, 2^20453632999 is an apocalyptic number.

20453632999 is a deficient number, since it is larger than the sum of its proper divisors (335305521).

20453632999 is an equidigital number, since it uses as much as digits as its factorization.

20453632999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335305520.

The product of its (nonzero) digits is 3149280, while the sum is 52.

The spelling of 20453632999 in words is "twenty billion, four hundred fifty-three million, six hundred thirty-two thousand, nine hundred ninety-nine".