20720073 has 16 divisors (see below), whose sum is σ = 30453696. Its totient is φ = 12426240.

The previous prime is 20720057. The next prime is 20720083. The reversal of 20720073 is 37002702.

It is not a de Polignac number, because 20720073 - 2⁴ = 20720057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20720083) 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, 36 + ... + 6437.

It is an arithmetic number, because the mean of its divisors is an integer number (1903356).

Almost surely, 2^20720073 is an apocalyptic number.

It is an amenable number.

20720073 is a deficient number, since it is larger than the sum of its proper divisors (9733623).

20720073 is a wasteful number, since it uses less digits than its factorization.

20720073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6584.

The product of its (nonzero) digits is 588, while the sum is 21.

The square root of 20720073 is about 4551.9306892790. The cubic root of 20720073 is about 274.6610612159.

Adding to 20720073 its reverse (37002702), we get a palindrome (57722775).

The spelling of 20720073 in words is "twenty million, seven hundred twenty thousand, seventy-three".