20798490 has 16 divisors (see below), whose sum is σ = 49916448. Its totient is φ = 5546256.

The previous prime is 20798473. The next prime is 20798501. The reversal of 20798490 is 9489702.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346612 + ... + 346671.

It is an arithmetic number, because the mean of its divisors is an integer number (3119778).

Almost surely, 2^20798490 is an apocalyptic number.

20798490 is an abundant number, since it is smaller than the sum of its proper divisors (29117958).

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

20798490 is a wasteful number, since it uses less digits than its factorization.

20798490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693293.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20798490 is about 4560.5361526908. The cubic root of 20798490 is about 275.0071182730.

The spelling of 20798490 in words is "twenty million, seven hundred ninety-eight thousand, four hundred ninety".