190020645 has 48 divisors (see below), whose sum is σ = 351449280. Its totient is φ = 94643712.

The previous prime is 190020629. The next prime is 190020647. The reversal of 190020645 is 546020091.

190020645 is a `hidden beast` number, since 19 + 0 + 0 + 2 + 0 + 645 = 666.

It is not a de Polignac number, because 190020645 - 2⁴ = 190020629 is a prime.

It is a super-2 number, since 2×190020645² = 72215691052432050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190020647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 105442 + ... + 107228.

It is an arithmetic number, because the mean of its divisors is an integer number (7321860).

Almost surely, 2^190020645 is an apocalyptic number.

190020645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

190020645 is a deficient number, since it is larger than the sum of its proper divisors (161428635).

190020645 is a wasteful number, since it uses less digits than its factorization.

190020645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954 (or 1951 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 190020645 is about 13784.7976046078. The cubic root of 190020645 is about 574.9105292422.

The spelling of 190020645 in words is "one hundred ninety million, twenty thousand, six hundred forty-five".