20713229 has 16 divisors (see below), whose sum is σ = 22311168. Its totient is φ = 19196352.

The previous prime is 20713219. The next prime is 20713243. The reversal of 20713229 is 92231702.

It is a cyclic number.

It is not a de Polignac number, because 20713229 - 2⁸ = 20712973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20713198 and 20713207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20713219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74639 + ... + 74915.

It is an arithmetic number, because the mean of its divisors is an integer number (1394448).

Almost surely, 2^20713229 is an apocalyptic number.

It is an amenable number.

20713229 is a deficient number, since it is larger than the sum of its proper divisors (1597939).

20713229 is a wasteful number, since it uses less digits than its factorization.

20713229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20713229 is about 4551.1788582740. The cubic root of 20713229 is about 274.6308169963.

The spelling of 20713229 in words is "twenty million, seven hundred thirteen thousand, two hundred twenty-nine".