20784090 has 32 divisors (see below), whose sum is σ = 50331456. Its totient is φ = 5492480.

The previous prime is 20784077. The next prime is 20784143. The reversal of 20784090 is 9048702.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 325 + ... + 6455.

It is an arithmetic number, because the mean of its divisors is an integer number (1572858).

Almost surely, 2^20784090 is an apocalyptic number.

20784090 is an abundant number, since it is smaller than the sum of its proper divisors (29547366).

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

20784090 is a wasteful number, since it uses less digits than its factorization.

20784090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6254.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20784090 is about 4558.9571175873. The cubic root of 20784090 is about 274.9436358313.

The spelling of 20784090 in words is "twenty million, seven hundred eighty-four thousand, ninety".