20998782 has 24 divisors (see below), whose sum is σ = 51997296. Its totient is φ = 5999616.

The previous prime is 20998777. The next prime is 20998787. The reversal of 20998782 is 28789902.

It is an interprime number because it is at equal distance from previous prime (20998777) and next prime (20998787).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20998787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83203 + ... + 83454.

It is an arithmetic number, because the mean of its divisors is an integer number (2166554).

Almost surely, 2^20998782 is an apocalyptic number.

20998782 is an abundant number, since it is smaller than the sum of its proper divisors (30998514).

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

20998782 is a wasteful number, since it uses less digits than its factorization.

20998782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166672 (or 166669 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 20998782 is about 4582.4427983337. The cubic root of 20998782 is about 275.8870836149.

The spelling of 20998782 in words is "twenty million, nine hundred ninety-eight thousand, seven hundred eighty-two".