20513726 has 8 divisors (see below), whose sum is σ = 30793800. Its totient is φ = 10249128.

The previous prime is 20513687. The next prime is 20513729. The reversal of 20513726 is 62731502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20513695 and 20513704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380 + ... + 6416.

It is an arithmetic number, because the mean of its divisors is an integer number (3849225).

Almost surely, 2^20513726 is an apocalyptic number.

20513726 is a deficient number, since it is larger than the sum of its proper divisors (10280074).

20513726 is a wasteful number, since it uses less digits than its factorization.

20513726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7738.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20513726 is about 4529.2080985532. The cubic root of 20513726 is about 273.7462530849.

It can be divided in two parts, 205 and 13726, that added together give a palindrome (13931).

The spelling of 20513726 in words is "twenty million, five hundred thirteen thousand, seven hundred twenty-six".