20720702 has 16 divisors (see below), whose sum is σ = 31993920. Its totient is φ = 10059648.

The previous prime is 20720681. The next prime is 20720717. The reversal of 20720702 is 20702702.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12074 + ... + 13682.

It is an arithmetic number, because the mean of its divisors is an integer number (1999620).

Almost surely, 2^20720702 is an apocalyptic number.

20720702 is a deficient number, since it is larger than the sum of its proper divisors (11273218).

20720702 is a wasteful number, since it uses less digits than its factorization.

20720702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795.

The product of its (nonzero) digits is 392, while the sum is 20.

The square root of 20720702 is about 4551.9997803163. Note that the first 3 decimals coincide. The cubic root of 20720702 is about 274.6638404863.

The spelling of 20720702 in words is "twenty million, seven hundred twenty thousand, seven hundred two".