20426742 has 40 divisors (see below), whose sum is σ = 52312656. Its totient is φ = 5835888.

The previous prime is 20426719. The next prime is 20426743. The reversal of 20426742 is 24762402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20426743) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7873 + ... + 10140.

Almost surely, 2^20426742 is an apocalyptic number.

20426742 is an abundant number, since it is smaller than the sum of its proper divisors (31885914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20426742 is a wasteful number, since it uses less digits than its factorization.

20426742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18034 (or 18025 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 20426742 is about 4519.5953358680. The cubic root of 20426742 is about 273.3587843972.

The spelling of 20426742 in words is "twenty million, four hundred twenty-six thousand, seven hundred forty-two".