20536890 has 32 divisors (see below), whose sum is σ = 53770176. Its totient is φ = 4978560.

The previous prime is 20536889. The next prime is 20536909. The reversal of 20536890 is 9863502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30787 + ... + 31446.

It is an arithmetic number, because the mean of its divisors is an integer number (1680318).

Almost surely, 2^20536890 is an apocalyptic number.

20536890 is an abundant number, since it is smaller than the sum of its proper divisors (33233286).

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

20536890 is a wasteful number, since it uses less digits than its factorization.

20536890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62254.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20536890 is about 4531.7645569910. The cubic root of 20536890 is about 273.8492519736.

The spelling of 20536890 in words is "twenty million, five hundred thirty-six thousand, eight hundred ninety".