20507642 has 8 divisors (see below), whose sum is σ = 30786996. Its totient is φ = 10245312.

The previous prime is 20507629. The next prime is 20507653. The reversal of 20507642 is 24670502.

It can be written as a sum of positive squares in 2 ways, for example, as 12103441 + 8404201 = 3479^2 + 2899^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623 + ... + 6434.

Almost surely, 2^20507642 is an apocalyptic number.

20507642 is a deficient number, since it is larger than the sum of its proper divisors (10279354).

20507642 is a wasteful number, since it uses less digits than its factorization.

20507642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8512.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20507642 is about 4528.5364081566. The cubic root of 20507642 is about 273.7191876804.

The spelling of 20507642 in words is "twenty million, five hundred seven thousand, six hundred forty-two".