20671798 has 16 divisors (see below), whose sum is σ = 35496864. Its totient is φ = 8844480.

The previous prime is 20671769. The next prime is 20671811. The reversal of 20671798 is 89717602.

It is a self number, because there is not a number n which added to its sum of digits gives 20671798.

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, 13218 + ... + 14698.

It is an arithmetic number, because the mean of its divisors is an integer number (2218554).

Almost surely, 2^20671798 is an apocalyptic number.

20671798 is a deficient number, since it is larger than the sum of its proper divisors (14825066).

20671798 is a wasteful number, since it uses less digits than its factorization.

20671798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 20671798 is about 4546.6249020565. The cubic root of 20671798 is about 274.4475874906.

The spelling of 20671798 in words is "twenty million, six hundred seventy-one thousand, seven hundred ninety-eight".