20723013 has 16 divisors (see below), whose sum is σ = 30771840. Its totient is φ = 13783392.

The previous prime is 20722993. The next prime is 20723029. The reversal of 20723013 is 31032702.

It is not a de Polignac number, because 20723013 - 2¹² = 20718917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20723063) 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, 19545 + ... + 20577.

It is an arithmetic number, because the mean of its divisors is an integer number (1923240).

Almost surely, 2^20723013 is an apocalyptic number.

It is an amenable number.

20723013 is a deficient number, since it is larger than the sum of its proper divisors (10048827).

20723013 is a wasteful number, since it uses less digits than its factorization.

20723013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785 (or 1779 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 20723013 is about 4552.2536177151. The cubic root of 20723013 is about 274.6740512816.

Adding to 20723013 its reverse (31032702), we get a palindrome (51755715).

It can be divided in two parts, 207 and 23013, that added together give a triangular number (23220 = T₂₁₅).

The spelling of 20723013 in words is "twenty million, seven hundred twenty-three thousand, thirteen".