20720703 has 32 divisors (see below), whose sum is σ = 30260160. Its totient is φ = 12579840.

The previous prime is 20720681. The next prime is 20720717. The reversal of 20720703 is 30702702.

It is a Cunningham number, because it is equal to 4552²-1.

20720703 is a nontrivial binomial coefficient, being equal to C(6438, 2).

It is not a de Polignac number, because 20720703 - 2¹⁷ = 20589631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20720703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131901 + ... + 132057.

It is an arithmetic number, because the mean of its divisors is an integer number (945630).

Almost surely, 2^20720703 is an apocalyptic number.

20720703 is the 6437-th triangular number and also the 3219-th hexagonal number.

20720703 is a deficient number, since it is larger than the sum of its proper divisors (9539457).

20720703 is a wasteful number, since it uses less digits than its factorization.

20720703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267.

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

The square root of 20720703 is about 4551.9998901582. Note that the first 3 decimals coincide. The cubic root of 20720703 is about 274.6638449048.

It can be divided in two parts, 207 and 20703, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20720703 in words is "twenty million, seven hundred twenty thousand, seven hundred three".