20420704 has 12 divisors (see below), whose sum is σ = 40203324. Its totient is φ = 10210336.

The previous prime is 20420681. The next prime is 20420759. The reversal of 20420704 is 40702402.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 319042 + ... + 319105.

It is an arithmetic number, because the mean of its divisors is an integer number (3350277).

Almost surely, 2^20420704 is an apocalyptic number.

It is an amenable number.

20420704 is a deficient number, since it is larger than the sum of its proper divisors (19782620).

20420704 is an equidigital number, since it uses as much as digits as its factorization.

20420704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638157 (or 638149 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 20420704 is about 4518.9273063416. The cubic root of 20420704 is about 273.3318474372.

The spelling of 20420704 in words is "twenty million, four hundred twenty thousand, seven hundred four".