20506702 has 4 divisors (see below), whose sum is σ = 30760056. Its totient is φ = 10253350.

The previous prime is 20506693. The next prime is 20506723. The reversal of 20506702 is 20760502.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5126674 + ... + 5126677.

It is an arithmetic number, because the mean of its divisors is an integer number (7690014).

Almost surely, 2^20506702 is an apocalyptic number.

20506702 is a deficient number, since it is larger than the sum of its proper divisors (10253354).

20506702 is a wasteful number, since it uses less digits than its factorization.

20506702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10253353.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20506702 is about 4528.4326206757. The cubic root of 20506702 is about 273.7150055001.

The spelling of 20506702 in words is "twenty million, five hundred six thousand, seven hundred two".