20071990 has 8 divisors (see below), whose sum is σ = 36129600. Its totient is φ = 8028792.

The previous prime is 20071963. The next prime is 20071991. The reversal of 20071990 is 9917002.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20071991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1003590 + ... + 1003609.

It is an arithmetic number, because the mean of its divisors is an integer number (4516200).

Almost surely, 2^20071990 is an apocalyptic number.

20071990 is a deficient number, since it is larger than the sum of its proper divisors (16057610).

20071990 is a wasteful number, since it uses less digits than its factorization.

20071990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007206.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 20071990 is about 4480.1774518427. The cubic root of 20071990 is about 271.7670565452.

Adding to 20071990 its reverse (9917002), we get a palindrome (29988992).

The spelling of 20071990 in words is "twenty million, seventy-one thousand, nine hundred ninety".