20545157 has 16 divisors (see below), whose sum is σ = 22118400. Its totient is φ = 19049520.

The previous prime is 20545153. The next prime is 20545159. The reversal of 20545157 is 75154502.

It is a cyclic number.

It is not a de Polignac number, because 20545157 - 2² = 20545153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85844 + ... + 86082.

It is an arithmetic number, because the mean of its divisors is an integer number (1382400).

Almost surely, 2^20545157 is an apocalyptic number.

It is an amenable number.

20545157 is a deficient number, since it is larger than the sum of its proper divisors (1573243).

20545157 is a wasteful number, since it uses less digits than its factorization.

20545157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 20545157 is about 4532.6765823297. The cubic root of 20545157 is about 273.8859924937.

Adding to 20545157 its reverse (75154502), we get a palindrome (95699659).

It can be divided in two parts, 20545 and 157, that added together give a palindrome (20702).

The spelling of 20545157 in words is "twenty million, five hundred forty-five thousand, one hundred fifty-seven".