20451944 has 8 divisors (see below), whose sum is σ = 38347410. Its totient is φ = 10225968.

The previous prime is 20451941. The next prime is 20451967. The reversal of 20451944 is 44915402.

It can be written as a sum of positive squares in only one way, i.e., 11222500 + 9229444 = 3350^2 + 3038^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20451941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278239 + ... + 1278254.

Almost surely, 2^20451944 is an apocalyptic number.

It is an amenable number.

20451944 is a deficient number, since it is larger than the sum of its proper divisors (17895466).

20451944 is a wasteful number, since it uses less digits than its factorization.

20451944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556499 (or 2556495 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20451944 is about 4522.3825579002. The cubic root of 20451944 is about 273.4711592568.

The spelling of 20451944 in words is "twenty million, four hundred fifty-one thousand, nine hundred forty-four".