20395642 has 12 divisors (see below), whose sum is σ = 31701870. Its totient is φ = 9829568.

The previous prime is 20395633. The next prime is 20395657. The reversal of 20395642 is 24659302.

It can be written as a sum of positive squares in 3 ways, for example, as 19000881 + 1394761 = 4359^2 + 1181^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34098 + ... + 34690.

Almost surely, 2^20395642 is an apocalyptic number.

20395642 is a deficient number, since it is larger than the sum of its proper divisors (11306228).

20395642 is an frugal number, since it uses more digits than its factorization.

20395642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217 (or 624 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 20395642 is about 4516.1534517773. The cubic root of 20395642 is about 273.2199830753.

The spelling of 20395642 in words is "twenty million, three hundred ninety-five thousand, six hundred forty-two".