19927145 has 32 divisors (see below), whose sum is σ = 29299968. Its totient is φ = 12699648.

The previous prime is 19927133. The next prime is 19927151. The reversal of 19927145 is 54172991.

It is a cyclic number.

It is not a de Polignac number, because 19927145 - 2⁴ = 19927129 is a prime.

It is a super-2 number, since 2×19927145² = 794182215702050, 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 = 19927099 and 19927108.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63509 + ... + 63821.

It is an arithmetic number, because the mean of its divisors is an integer number (915624).

Almost surely, 2^19927145 is an apocalyptic number.

It is an amenable number.

19927145 is a deficient number, since it is larger than the sum of its proper divisors (9372823).

19927145 is a wasteful number, since it uses less digits than its factorization.

19927145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449.

The product of its digits is 22680, while the sum is 38.

The square root of 19927145 is about 4463.9830868855. The cubic root of 19927145 is about 271.1117624739. Note that the first 3 decimals are identical.

The spelling of 19927145 in words is "nineteen million, nine hundred twenty-seven thousand, one hundred forty-five".