20006742 has 16 divisors (see below), whose sum is σ = 45729792. Its totient is φ = 5716200.

The previous prime is 20006741. The next prime is 20006743. The reversal of 20006742 is 24760002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20006741) and next prime (20006743).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20006741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238134 + ... + 238217.

It is an arithmetic number, because the mean of its divisors is an integer number (2858112).

Almost surely, 2^20006742 is an apocalyptic number.

20006742 is an abundant number, since it is smaller than the sum of its proper divisors (25723050).

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

20006742 is a wasteful number, since it uses less digits than its factorization.

20006742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476363.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20006742 is about 4472.8896700008. The cubic root of 20006742 is about 271.4722592388.

Adding to 20006742 its reverse (24760002), we get a palindrome (44766744).

The spelling of 20006742 in words is "twenty million, six thousand, seven hundred forty-two".