20507912 has 8 divisors (see below), whose sum is σ = 38452350. Its totient is φ = 10253952.

The previous prime is 20507911. The next prime is 20507969. The reversal of 20507912 is 21970502.

It can be written as a sum of positive squares in only one way, i.e., 13293316 + 7214596 = 3646^2 + 2686^2 .

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 (20507911) by changing a digit.

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, 1281737 + ... + 1281752.

Almost surely, 2^20507912 is an apocalyptic number.

It is an amenable number.

20507912 is a deficient number, since it is larger than the sum of its proper divisors (17944438).

20507912 is a wasteful number, since it uses less digits than its factorization.

20507912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563495 (or 2563491 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 20507912 is about 4528.5662190146. The cubic root of 20507912 is about 273.7203889213.

The spelling of 20507912 in words is "twenty million, five hundred seven thousand, nine hundred twelve".