19955645 has 8 divisors (see below), whose sum is σ = 24275256. Its totient is φ = 15745536.

The previous prime is 19955641. The next prime is 19955647. The reversal of 19955645 is 54655991.

It can be written as a sum of positive squares in 4 ways, for example, as 436921 + 19518724 = 661^2 + 4418^2 .

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 19955645 - 2² = 19955641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19955596 and 19955605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19955641) 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, 26972 + ... + 27701.

It is an arithmetic number, because the mean of its divisors is an integer number (3034407).

Almost surely, 2^19955645 is an apocalyptic number.

It is an amenable number.

19955645 is a deficient number, since it is larger than the sum of its proper divisors (4319611).

19955645 is an equidigital number, since it uses as much as digits as its factorization.

19955645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54751.

The product of its digits is 243000, while the sum is 44.

The square root of 19955645 is about 4467.1741627118. The cubic root of 19955645 is about 271.2409498138.

The spelling of 19955645 in words is "nineteen million, nine hundred fifty-five thousand, six hundred forty-five".