20513733 has 8 divisors (see below), whose sum is σ = 27373728. Its totient is φ = 13664784.

The previous prime is 20513729. The next prime is 20513767. The reversal of 20513733 is 33731502.

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

It is not a de Polignac number, because 20513733 - 2² = 20513729 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3810 + ... + 7452.

It is an arithmetic number, because the mean of its divisors is an integer number (3421716).

Almost surely, 2^20513733 is an apocalyptic number.

It is an amenable number.

20513733 is a deficient number, since it is larger than the sum of its proper divisors (6859995).

20513733 is a wasteful number, since it uses less digits than its factorization.

20513733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5523.

The product of its (nonzero) digits is 1890, while the sum is 24.

The square root of 20513733 is about 4529.2088713152. The cubic root of 20513733 is about 273.7462842222.

The spelling of 20513733 in words is "twenty million, five hundred thirteen thousand, seven hundred thirty-three".