20104157 has 8 divisors (see below), whose sum is σ = 20490240. Its totient is φ = 19721520.

The previous prime is 20104153. The next prime is 20104159. The reversal of 20104157 is 75140102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20104157 - 2² = 20104153 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 (20104153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12932 + ... + 14402.

It is an arithmetic number, because the mean of its divisors is an integer number (2561280).

Almost surely, 2^20104157 is an apocalyptic number.

It is an amenable number.

20104157 is a deficient number, since it is larger than the sum of its proper divisors (386083).

20104157 is a wasteful number, since it uses less digits than its factorization.

20104157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 20104157 is about 4483.7659394754. The cubic root of 20104157 is about 271.9121553483.

Adding to 20104157 its reverse (75140102), we get a palindrome (95244259).

It can be divided in two parts, 20104 and 157, that multiplied together give a triangular number (3156328 = T₂₅₁₂).

The spelling of 20104157 in words is "twenty million, one hundred four thousand, one hundred fifty-seven".