20305742 has 16 divisors (see below), whose sum is σ = 32281200. Its totient is φ = 9562560.

The previous prime is 20305693. The next prime is 20305777. The reversal of 20305742 is 24750302.

20305742 is a modest number, since divided by 5742 gives 2030 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1892 + ... + 6647.

It is an arithmetic number, because the mean of its divisors is an integer number (2017575).

Almost surely, 2^20305742 is an apocalyptic number.

20305742 is a deficient number, since it is larger than the sum of its proper divisors (11975458).

20305742 is a wasteful number, since it uses less digits than its factorization.

20305742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8611.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20305742 is about 4506.1892991751. The cubic root of 20305742 is about 272.8179584013.

The spelling of 20305742 in words is "twenty million, three hundred five thousand, seven hundred forty-two".