20798784 has 42 divisors (see below), whose sum is σ = 59617610. Its totient is φ = 6932736.

The previous prime is 20798759. The next prime is 20798797. The reversal of 20798784 is 48789702.

It can be written as a sum of positive squares in only one way, i.e., 20793600 + 5184 = 4560^2 + 72^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17479 + ... + 18630.

Almost surely, 2^20798784 is an apocalyptic number.

20798784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20798784 is an abundant number, since it is smaller than the sum of its proper divisors (38818826).

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

20798784 is a wasteful number, since it uses less digits than its factorization.

20798784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36127 (or 36114 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 20798784 is about 4560.5683856291. The cubic root of 20798784 is about 275.0084140676.

Adding to 20798784 its product of nonzero digits (225792), we get a cube (21024576 = 276³).

The spelling of 20798784 in words is "twenty million, seven hundred ninety-eight thousand, seven hundred eighty-four".