20553236129 has 4 divisors (see below), whose sum is σ = 20842718400. Its totient is φ = 20263753860.

The previous prime is 20553236107. The next prime is 20553236141. The reversal of 20553236129 is 92163235502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20553236129 - 2³² = 16258268833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20553236092 and 20553236101.

It is not an unprimeable number, because it can be changed into a prime (20553236329) 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, 144741029 + ... + 144741170.

It is an arithmetic number, because the mean of its divisors is an integer number (5210679600).

Almost surely, 2^20553236129 is an apocalyptic number.

It is an amenable number.

20553236129 is a deficient number, since it is larger than the sum of its proper divisors (289482271).

20553236129 is an equidigital number, since it uses as much as digits as its factorization.

20553236129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289482270.

The product of its (nonzero) digits is 97200, while the sum is 38.

The spelling of 20553236129 in words is "twenty billion, five hundred fifty-three million, two hundred thirty-six thousand, one hundred twenty-nine".