20798442 has 36 divisors (see below), whose sum is σ = 52422786. Its totient is φ = 5942160.

The previous prime is 20798413. The next prime is 20798443. The reversal of 20798442 is 24489702.

20798442 is a `hidden beast` number, since 207 + 9 + 8 + 442 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19263321 + 1535121 = 4389^2 + 1239^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20798397 and 20798406.

It is not an unprimeable number, because it can be changed into a prime (20798443) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10909 + ... + 12672.

Almost surely, 2^20798442 is an apocalyptic number.

20798442 is an abundant number, since it is smaller than the sum of its proper divisors (31624344).

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

20798442 is a wasteful number, since it uses less digits than its factorization.

20798442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23603 (or 23593 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20798442 is about 4560.5308901486. The cubic root of 20798442 is about 275.0069067136.

The spelling of 20798442 in words is "twenty million, seven hundred ninety-eight thousand, four hundred forty-two".