20770157 has 4 divisors (see below), whose sum is σ = 20835996. Its totient is φ = 20704320.

The previous prime is 20770147. The next prime is 20770163. The reversal of 20770157 is 75107702.

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 5669161 + 15100996 = 2381^2 + 3886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20770157 - 2⁸ = 20769901 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 (20770147) 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, 32444 + ... + 33077.

It is an arithmetic number, because the mean of its divisors is an integer number (5208999).

Almost surely, 2^20770157 is an apocalyptic number.

It is an amenable number.

20770157 is a deficient number, since it is larger than the sum of its proper divisors (65839).

20770157 is an equidigital number, since it uses as much as digits as its factorization.

20770157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65838.

The product of its (nonzero) digits is 3430, while the sum is 29.

The square root of 20770157 is about 4557.4287706995. The cubic root of 20770157 is about 274.8821842432.

Adding to 20770157 its reverse (75107702), we get a palindrome (95877859).

The spelling of 20770157 in words is "twenty million, seven hundred seventy thousand, one hundred fifty-seven".