20720090 has 32 divisors (see below), whose sum is σ = 38983680. Its totient is φ = 7920000.

The previous prime is 20720087. The next prime is 20720107. The reversal of 20720090 is 9002702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27215 + ... + 27965.

It is an arithmetic number, because the mean of its divisors is an integer number (1218240).

Almost surely, 2^20720090 is an apocalyptic number.

20720090 is a deficient number, since it is larger than the sum of its proper divisors (18263590).

20720090 is a wasteful number, since it uses less digits than its factorization.

20720090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 20720090 is about 4551.9325566181. The cubic root of 20720090 is about 274.6611363320.

Adding to 20720090 its reverse (9002702), we get a palindrome (29722792).

The spelling of 20720090 in words is "twenty million, seven hundred twenty thousand, ninety".