20420968 has 8 divisors (see below), whose sum is σ = 38289330. Its totient is φ = 10210480.

The previous prime is 20420957. The next prime is 20420977. The reversal of 20420968 is 86902402.

It can be written as a sum of positive squares in only one way, i.e., 17455684 + 2965284 = 4178^2 + 1722^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1276303 + ... + 1276318.

Almost surely, 2^20420968 is an apocalyptic number.

It is an amenable number.

20420968 is a deficient number, since it is larger than the sum of its proper divisors (17868362).

20420968 is a wasteful number, since it uses less digits than its factorization.

20420968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2552627 (or 2552623 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20420968 is about 4518.9565167193. The cubic root of 20420968 is about 273.3330253153. Note that the first 3 decimals are identical.

The spelling of 20420968 in words is "twenty million, four hundred twenty thousand, nine hundred sixty-eight".