20513936 has 10 divisors (see below), whose sum is σ = 39745782. Its totient is φ = 10256960.

The previous prime is 20513921. The next prime is 20513963. The reversal of 20513936 is 63931502.

It can be written as a sum of positive squares in only one way, i.e., 17472400 + 3041536 = 4180^2 + 1744^2 .

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 20513899 and 20513908.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641045 + ... + 641076.

Almost surely, 2^20513936 is an apocalyptic number.

It is an amenable number.

20513936 is a deficient number, since it is larger than the sum of its proper divisors (19231846).

20513936 is a wasteful number, since it uses less digits than its factorization.

20513936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282129 (or 1282123 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 20513936 is about 4529.2312813545. The cubic root of 20513936 is about 273.7471871996.

It can be divided in two parts, 205 and 13936, that added together give a palindrome (14141).

The spelling of 20513936 in words is "twenty million, five hundred thirteen thousand, nine hundred thirty-six".