20754157 has 4 divisors (see below), whose sum is σ = 20831580. Its totient is φ = 20676736.

The previous prime is 20754133. The next prime is 20754179. The reversal of 20754157 is 75145702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7584516 + 13169641 = 2754^2 + 3629^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20754157 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 (20754757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38308 + ... + 38845.

It is an arithmetic number, because the mean of its divisors is an integer number (5207895).

Almost surely, 2^20754157 is an apocalyptic number.

It is an amenable number.

20754157 is a deficient number, since it is larger than the sum of its proper divisors (77423).

20754157 is an equidigital number, since it uses as much as digits as its factorization.

20754157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77422.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 20754157 is about 4555.6730567502. The cubic root of 20754157 is about 274.8115822288.

Adding to 20754157 its reverse (75145702), we get a palindrome (95899859).

The spelling of 20754157 in words is "twenty million, seven hundred fifty-four thousand, one hundred fifty-seven".