20513392 has 20 divisors (see below), whose sum is σ = 40820056. Its totient is φ = 9979200.

The previous prime is 20513371. The next prime is 20513393. The reversal of 20513392 is 29331502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513393) 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, 16734 + ... + 17917.

Almost surely, 2^20513392 is an apocalyptic number.

It is an amenable number.

20513392 is a deficient number, since it is larger than the sum of its proper divisors (20306664).

20513392 is a wasteful number, since it uses less digits than its factorization.

20513392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34696 (or 34690 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 20513392 is about 4529.1712266153. The cubic root of 20513392 is about 273.7447673847.

Adding to 20513392 its reverse (29331502), we get a palindrome (49844894).

The spelling of 20513392 in words is "twenty million, five hundred thirteen thousand, three hundred ninety-two".