20887490 has 64 divisors (see below), whose sum is σ = 42964992. Its totient is φ = 7257600.

The previous prime is 20887483. The next prime is 20887541. The reversal of 20887490 is 9478802.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 286094 + ... + 286166.

It is an arithmetic number, because the mean of its divisors is an integer number (671328).

Almost surely, 2^20887490 is an apocalyptic number.

20887490 is an abundant number, since it is smaller than the sum of its proper divisors (22077502).

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

20887490 is a wasteful number, since it uses less digits than its factorization.

20887490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20887490 is about 4570.2833610182. The cubic root of 20887490 is about 275.3988262704.

The spelling of 20887490 in words is "twenty million, eight hundred eighty-seven thousand, four hundred ninety".