20256742 has 8 divisors (see below), whose sum is σ = 33147432. Its totient is φ = 9207600.

The previous prime is 20256737. The next prime is 20256751. The reversal of 20256742 is 24765202.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20256742.

It is a congruent number.

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, 460359 + ... + 460402.

It is an arithmetic number, because the mean of its divisors is an integer number (4143429).

Almost surely, 2^20256742 is an apocalyptic number.

20256742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20256742 is a deficient number, since it is larger than the sum of its proper divisors (12890690).

20256742 is a wasteful number, since it uses less digits than its factorization.

20256742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920774.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 20256742 is about 4500.7490487695. The cubic root of 20256742 is about 272.5983350178.

The spelling of 20256742 in words is "twenty million, two hundred fifty-six thousand, seven hundred forty-two".