20157611 has 4 divisors (see below), whose sum is σ = 20175000. Its totient is φ = 20140224.

The previous prime is 20157593. The next prime is 20157617. The reversal of 20157611 is 11675102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20157611 - 2¹⁸ = 19895467 is a prime.

It is a Duffinian number.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (20157617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6821 + ... + 9318.

It is an arithmetic number, because the mean of its divisors is an integer number (5043750).

Almost surely, 2^20157611 is an apocalyptic number.

20157611 is a deficient number, since it is larger than the sum of its proper divisors (17389).

20157611 is a wasteful number, since it uses less digits than its factorization.

20157611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17388.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 20157611 is about 4489.7228199523. The cubic root of 20157611 is about 272.1529335679.

The spelling of 20157611 in words is "twenty million, one hundred fifty-seven thousand, six hundred eleven".