20216990 has 8 divisors (see below), whose sum is σ = 36390600. Its totient is φ = 8086792.

The previous prime is 20216981. The next prime is 20217019. The reversal of 20216990 is 9961202.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010840 + ... + 1010859.

It is an arithmetic number, because the mean of its divisors is an integer number (4548825).

Almost surely, 2^20216990 is an apocalyptic number.

20216990 is a deficient number, since it is larger than the sum of its proper divisors (16173610).

20216990 is a wasteful number, since it uses less digits than its factorization.

20216990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021706.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 20216990 is about 4496.3307262700. The cubic root of 20216990 is about 272.4199018294.

The spelling of 20216990 in words is "twenty million, two hundred sixteen thousand, nine hundred ninety".