20507944 has 8 divisors (see below), whose sum is σ = 38452410. Its totient is φ = 10253968.

The previous prime is 20507911. The next prime is 20507969. The reversal of 20507944 is 44970502.

It can be written as a sum of positive squares in only one way, i.e., 16305444 + 4202500 = 4038^2 + 2050^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1281739 + ... + 1281754.

Almost surely, 2^20507944 is an apocalyptic number.

It is an amenable number.

20507944 is a deficient number, since it is larger than the sum of its proper divisors (17944466).

20507944 is a wasteful number, since it uses less digits than its factorization.

20507944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563499 (or 2563495 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20507944 is about 4528.5697521403. The cubic root of 20507944 is about 273.7205312899.

The spelling of 20507944 in words is "twenty million, five hundred seven thousand, nine hundred forty-four".