20218742 has 16 divisors (see below), whose sum is σ = 32045760. Its totient is φ = 9551808.

The previous prime is 20218721. The next prime is 20218787. The reversal of 20218742 is 24781202.

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, 983 + ... + 6434.

It is an arithmetic number, because the mean of its divisors is an integer number (2002860).

Almost surely, 2^20218742 is an apocalyptic number.

20218742 is a deficient number, since it is larger than the sum of its proper divisors (11827018).

20218742 is a wasteful number, since it uses less digits than its factorization.

20218742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7495.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 20218742 is about 4496.5255475756. The cubic root of 20218742 is about 272.4277708855.

Adding to 20218742 its reverse (24781202), we get a palindrome (44999944).

The spelling of 20218742 in words is "twenty million, two hundred eighteen thousand, seven hundred forty-two".