20425513 has 4 divisors (see below), whose sum is σ = 21500560. Its totient is φ = 19350468.

The previous prime is 20425507. The next prime is 20425519. The reversal of 20425513 is 31552402.

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 an interprime number because it is at equal distance from previous prime (20425507) and next prime (20425519).

It is a cyclic number.

It is not a de Polignac number, because 20425513 - 2⁵ = 20425481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20425519) 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, 537495 + ... + 537532.

It is an arithmetic number, because the mean of its divisors is an integer number (5375140).

Almost surely, 2^20425513 is an apocalyptic number.

It is an amenable number.

20425513 is a deficient number, since it is larger than the sum of its proper divisors (1075047).

20425513 is a wasteful number, since it uses less digits than its factorization.

20425513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075046.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20425513 is about 4519.4593703230. The cubic root of 20425513 is about 273.3533019650.

Adding to 20425513 its reverse (31552402), we get a palindrome (51977915).

The spelling of 20425513 in words is "twenty million, four hundred twenty-five thousand, five hundred thirteen".