20303890 has 8 divisors (see below), whose sum is σ = 36547020. Its totient is φ = 8121552.

The previous prime is 20303887. The next prime is 20303903. The reversal of 20303890 is 9830302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19368801 + 935089 = 4401^2 + 967^2 .

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

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, 1015185 + ... + 1015204.

Almost surely, 2^20303890 is an apocalyptic number.

20303890 is a deficient number, since it is larger than the sum of its proper divisors (16243130).

20303890 is a wasteful number, since it uses less digits than its factorization.

20303890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030396.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20303890 is about 4505.9837993495. The cubic root of 20303890 is about 272.8096639622.

The spelling of 20303890 in words is "twenty million, three hundred three thousand, eight hundred ninety".