20257742 has 8 divisors (see below), whose sum is σ = 30591000. Its totient is φ = 10060744.

The previous prime is 20257729. The next prime is 20257751. The reversal of 20257742 is 24775202.

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

It is a super-2 number, since 2×20257742² = 820752221877128, which contains 22 as substring.

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, 33692 + ... + 34287.

It is an arithmetic number, because the mean of its divisors is an integer number (3823875).

Almost surely, 2^20257742 is an apocalyptic number.

20257742 is a deficient number, since it is larger than the sum of its proper divisors (10333258).

20257742 is a wasteful number, since it uses less digits than its factorization.

20257742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68130.

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 20257742 is about 4500.8601400177. The cubic root of 20257742 is about 272.6028206660.

The spelling of 20257742 in words is "twenty million, two hundred fifty-seven thousand, seven hundred forty-two".