20159645 has 16 divisors (see below), whose sum is σ = 26490240. Its totient is φ = 14606400.

The previous prime is 20159639. The next prime is 20159681. The reversal of 20159645 is 54695102.

It is a happy number.

It is not a de Polignac number, because 20159645 - 2²⁰ = 19111069 is a prime.

It is a super-2 number, since 2×20159645² = 812822573052050, which contains 22 as substring.

It is a congruent number.

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, 19235 + ... + 20255.

It is an arithmetic number, because the mean of its divisors is an integer number (1655640).

Almost surely, 2^20159645 is an apocalyptic number.

It is an amenable number.

20159645 is a deficient number, since it is larger than the sum of its proper divisors (6330595).

20159645 is a wasteful number, since it uses less digits than its factorization.

20159645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 20159645 is about 4489.9493315627. The cubic root of 20159645 is about 272.1620871071.

The spelling of 20159645 in words is "twenty million, one hundred fifty-nine thousand, six hundred forty-five".