20707930 has 8 divisors (see below), whose sum is σ = 37274292. Its totient is φ = 8283168.

The previous prime is 20707903. The next prime is 20707933. The reversal of 20707930 is 3970702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16719921 + 3988009 = 4089^2 + 1997^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20707933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1035387 + ... + 1035406.

Almost surely, 2^20707930 is an apocalyptic number.

20707930 is a deficient number, since it is larger than the sum of its proper divisors (16566362).

20707930 is a wasteful number, since it uses less digits than its factorization.

20707930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070800.

The product of its (nonzero) digits is 2646, while the sum is 28.

The square root of 20707930 is about 4550.5966641749. The cubic root of 20707930 is about 274.6073956872.

It can be divided in two parts, 2070 and 7930, that added together give a 4-th power (10000 = 10⁴).

The spelling of 20707930 in words is "twenty million, seven hundred seven thousand, nine hundred thirty".