20520157 has 8 divisors (see below), whose sum is σ = 23802176. Its totient is φ = 17325792.

The previous prime is 20520103. The next prime is 20520161. The reversal of 20520157 is 75102502.

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 20520157 - 2⁷ = 20520029 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 (20520167) 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, 21408 + ... + 22345.

It is an arithmetic number, because the mean of its divisors is an integer number (2975272).

Almost surely, 2^20520157 is an apocalyptic number.

It is an amenable number.

20520157 is a deficient number, since it is larger than the sum of its proper divisors (3282019).

20520157 is an equidigital number, since it uses as much as digits as its factorization.

20520157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43827.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 20520157 is about 4529.9179904276. The cubic root of 20520157 is about 273.7748563434.

Adding to 20520157 its reverse (75102502), we get a palindrome (95622659).

The spelling of 20520157 in words is "twenty million, five hundred twenty thousand, one hundred fifty-seven".