20510157 has 8 divisors (see below), whose sum is σ = 27429376. Its totient is φ = 13632192.

The previous prime is 20510137. The next prime is 20510159. The reversal of 20510157 is 75101502.

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

It is not a de Polignac number, because 20510157 - 2¹⁰ = 20509133 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 (20510159) 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, 9133 + ... + 11154.

It is an arithmetic number, because the mean of its divisors is an integer number (3428672).

Almost surely, 2^20510157 is an apocalyptic number.

It is an amenable number.

20510157 is a deficient number, since it is larger than the sum of its proper divisors (6919219).

20510157 is a wasteful number, since it uses less digits than its factorization.

20510157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20627.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 20510157 is about 4528.8140831790. The cubic root of 20510157 is about 273.7303766088.

Adding to 20510157 its reverse (75101502), we get a palindrome (95611659).

The spelling of 20510157 in words is "twenty million, five hundred ten thousand, one hundred fifty-seven".