20621704 has 16 divisors (see below), whose sum is σ = 38785500. Its totient is φ = 10278912.

The previous prime is 20621693. The next prime is 20621759. The reversal of 20621704 is 40712602.

It can be written as a sum of positive squares in 2 ways, for example, as 17388900 + 3232804 = 4170^2 + 1798^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1129 + ... + 6520.

Almost surely, 2^20621704 is an apocalyptic number.

It is an amenable number.

20621704 is a deficient number, since it is larger than the sum of its proper divisors (18163796).

20621704 is a wasteful number, since it uses less digits than its factorization.

20621704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7992 (or 7988 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20621704 is about 4541.1126389906. The cubic root of 20621704 is about 274.2257184213.

The spelling of 20621704 in words is "twenty million, six hundred twenty-one thousand, seven hundred four".