20425013 has 12 divisors (see below), whose sum is σ = 23875020. Its totient is φ = 17422272.

The previous prime is 20424983. The next prime is 20425021. The reversal of 20425013 is 31052402.

It can be written as a sum of positive squares in 2 ways, for example, as 12545764 + 7879249 = 3542^2 + 2807^2 .

It is not a de Polignac number, because 20425013 - 2¹⁰ = 20423989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20424982 and 20425000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10523 + ... + 12311.

It is an arithmetic number, because the mean of its divisors is an integer number (1989585).

Almost surely, 2^20425013 is an apocalyptic number.

It is an amenable number.

20425013 is a deficient number, since it is larger than the sum of its proper divisors (3450007).

20425013 is a wasteful number, since it uses less digits than its factorization.

20425013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036 (or 2029 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20425013 is about 4519.4040536336. The cubic root of 20425013 is about 273.3510714577.

Adding to 20425013 its reverse (31052402), we get a palindrome (51477415).

The spelling of 20425013 in words is "twenty million, four hundred twenty-five thousand, thirteen".