20500890 has 32 divisors (see below), whose sum is σ = 49412160. Its totient is φ = 5443584.

The previous prime is 20500871. The next prime is 20500897. The reversal of 20500890 is 9800502.

It is a self number, because there is not a number n which added to its sum of digits gives 20500890.

It is not an unprimeable number, because it can be changed into a prime (20500897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6381 + ... + 9039.

It is an arithmetic number, because the mean of its divisors is an integer number (1544130).

Almost surely, 2^20500890 is an apocalyptic number.

20500890 is an abundant number, since it is smaller than the sum of its proper divisors (28911270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20500890 is a wasteful number, since it uses less digits than its factorization.

20500890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2926.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 20500890 is about 4527.7908520602. The cubic root of 20500890 is about 273.6891443300.

The spelling of 20500890 in words is "twenty million, five hundred thousand, eight hundred ninety".