20126513 has 4 divisors (see below), whose sum is σ = 21956208. Its totient is φ = 18296820.

The previous prime is 20126507. The next prime is 20126527. The reversal of 20126513 is 31562102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20126513 - 2⁴ = 20126497 is a prime.

It is a super-3 number, since 3×20126513³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20126503) 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, 914831 + ... + 914852.

It is an arithmetic number, because the mean of its divisors is an integer number (5489052).

Almost surely, 2^20126513 is an apocalyptic number.

It is an amenable number.

20126513 is a deficient number, since it is larger than the sum of its proper divisors (1829695).

20126513 is a wasteful number, since it uses less digits than its factorization.

20126513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829694.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20126513 is about 4486.2582404494. The cubic root of 20126513 is about 272.0129075838.

Adding to 20126513 its reverse (31562102), we get a palindrome (51688615).

The spelling of 20126513 in words is "twenty million, one hundred twenty-six thousand, five hundred thirteen".