20884890 has 32 divisors (see below), whose sum is σ = 53980416. Its totient is φ = 5140800.

The previous prime is 20884861. The next prime is 20884907. The reversal of 20884890 is 9848802.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 26386 + ... + 27165.

It is an arithmetic number, because the mean of its divisors is an integer number (1686888).

Almost surely, 2^20884890 is an apocalyptic number.

20884890 is an abundant number, since it is smaller than the sum of its proper divisors (33095526).

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

20884890 is a wasteful number, since it uses less digits than its factorization.

20884890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53574.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 20884890 is about 4569.9989059080. The cubic root of 20884890 is about 275.3873989094.

The spelling of 20884890 in words is "twenty million, eight hundred eighty-four thousand, eight hundred ninety".