20500990 has 8 divisors (see below), whose sum is σ = 36901800. Its totient is φ = 8200392.

The previous prime is 20500973. The next prime is 20501009. The reversal of 20500990 is 9900502.

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, 1025040 + ... + 1025059.

It is an arithmetic number, because the mean of its divisors is an integer number (4612725).

Almost surely, 2^20500990 is an apocalyptic number.

20500990 is a deficient number, since it is larger than the sum of its proper divisors (16400810).

20500990 is a wasteful number, since it uses less digits than its factorization.

20500990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050106.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 20500990 is about 4527.8018949596. The cubic root of 20500990 is about 273.6895893329.

The spelling of 20500990 in words is "twenty million, five hundred thousand, nine hundred ninety".