20408145 has 16 divisors (see below), whose sum is σ = 33022080. Its totient is φ = 10761344.

The previous prime is 20408117. The next prime is 20408189. The reversal of 20408145 is 54180402.

It is a cyclic number.

It is not a de Polignac number, because 20408145 - 2⁶ = 20408081 is a prime.

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, 6309 + ... + 8978.

It is an arithmetic number, because the mean of its divisors is an integer number (2063880).

Almost surely, 2^20408145 is an apocalyptic number.

It is an amenable number.

20408145 is a deficient number, since it is larger than the sum of its proper divisors (12613935).

20408145 is a wasteful number, since it uses less digits than its factorization.

20408145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15384.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 20408145 is about 4517.5374929269. The cubic root of 20408145 is about 273.2758017259.

Adding to 20408145 its reverse (54180402), we get a palindrome (74588547).

The spelling of 20408145 in words is "twenty million, four hundred eight thousand, one hundred forty-five".