19956145 has 16 divisors (see below), whose sum is σ = 26339328. Its totient is φ = 14394240.

The previous prime is 19956133. The next prime is 19956161. The reversal of 19956145 is 54165991.

It is not a de Polignac number, because 19956145 - 2⁹ = 19955633 is a prime.

It is a super-2 number, since 2×19956145² = 796495446522050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19956098 and 19956107.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5557 + ... + 8413.

It is an arithmetic number, because the mean of its divisors is an integer number (1646208).

Almost surely, 2^19956145 is an apocalyptic number.

It is an amenable number.

19956145 is a deficient number, since it is larger than the sum of its proper divisors (6383183).

19956145 is a wasteful number, since it uses less digits than its factorization.

19956145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000.

The product of its digits is 48600, while the sum is 40.

The square root of 19956145 is about 4467.2301261520. The cubic root of 19956145 is about 271.2432151601.

The spelling of 19956145 in words is "nineteen million, nine hundred fifty-six thousand, one hundred forty-five".