20720673 has 24 divisors (see below), whose sum is σ = 30667520. Its totient is φ = 13478400.

The previous prime is 20720653. The next prime is 20720681. The reversal of 20720673 is 37602702.

It is not a de Polignac number, because 20720673 - 2⁸ = 20720417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20720633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107265 + ... + 107457.

Almost surely, 2^20720673 is an apocalyptic number.

It is an amenable number.

20720673 is a deficient number, since it is larger than the sum of its proper divisors (9946847).

20720673 is a wasteful number, since it uses less digits than its factorization.

20720673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 20720673 is about 4551.9965949021. The cubic root of 20720673 is about 274.6637123495.

The spelling of 20720673 in words is "twenty million, seven hundred twenty thousand, six hundred seventy-three".