20798775 has 30 divisors (see below), whose sum is σ = 38530272. Its totient is φ = 11091600.

The previous prime is 20798759. The next prime is 20798797. The reversal of 20798775 is 57789702.

It is not a de Polignac number, because 20798775 - 2⁴ = 20798759 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20798775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 3111 + ... + 7160.

Almost surely, 2^20798775 is an apocalyptic number.

20798775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20798775 is a deficient number, since it is larger than the sum of its proper divisors (17731497).

20798775 is a wasteful number, since it uses less digits than its factorization.

20798775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10293 (or 10279 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 20798775 is about 4560.5673989099. The cubic root of 20798775 is about 275.0083744006.

The spelling of 20798775 in words is "twenty million, seven hundred ninety-eight thousand, seven hundred seventy-five".