20551554145 has 8 divisors (see below), whose sum is σ = 24974040960. Its totient is φ = 16233126000.

The previous prime is 20551554143. The next prime is 20551554151. The reversal of 20551554145 is 54145515502.

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

It is not a de Polignac number, because 20551554145 - 2¹ = 20551554143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20551554143) 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, 26014231 + ... + 26015020.

It is an arithmetic number, because the mean of its divisors is an integer number (3121755120).

Almost surely, 2^20551554145 is an apocalyptic number.

It is an amenable number.

20551554145 is a deficient number, since it is larger than the sum of its proper divisors (4422486815).

20551554145 is an equidigital number, since it uses as much as digits as its factorization.

20551554145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52029335.

The product of its (nonzero) digits is 100000, while the sum is 37.

The spelling of 20551554145 in words is "twenty billion, five hundred fifty-one million, five hundred fifty-four thousand, one hundred forty-five".