20720701 has 4 divisors (see below), whose sum is σ = 20970432. Its totient is φ = 20470972.

The previous prime is 20720681. The next prime is 20720717. The reversal of 20720701 is 10702702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10702702 = 2 ⋅5351351.

It is a cyclic number.

It is not a de Polignac number, because 20720701 - 2¹⁷ = 20589629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124741 + ... + 124906.

It is an arithmetic number, because the mean of its divisors is an integer number (5242608).

Almost surely, 2^20720701 is an apocalyptic number.

It is an amenable number.

20720701 is a deficient number, since it is larger than the sum of its proper divisors (249731).

20720701 is an equidigital number, since it uses as much as digits as its factorization.

20720701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249730.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 20720701 is about 4551.9996704745. Note that the first 3 decimals coincide. The cubic root of 20720701 is about 274.6638360678.

The spelling of 20720701 in words is "twenty million, seven hundred twenty thousand, seven hundred one".