20244990 has 16 divisors (see below), whose sum is σ = 48588048. Its totient is φ = 5398656.

The previous prime is 20244989. The next prime is 20245007. The reversal of 20244990 is 9944202.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 674833 = 20244990 / (2 + 0 + 2 + 4 + 4 + 9 + 9 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337387 + ... + 337446.

It is an arithmetic number, because the mean of its divisors is an integer number (3036753).

Almost surely, 2^20244990 is an apocalyptic number.

20244990 is an abundant number, since it is smaller than the sum of its proper divisors (28343058).

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

20244990 is a wasteful number, since it uses less digits than its factorization.

20244990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674843.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20244990 is about 4499.4432988982. The cubic root of 20244990 is about 272.5456086160.

The spelling of 20244990 in words is "twenty million, two hundred forty-four thousand, nine hundred ninety".