20259801 has 20 divisors (see below), whose sum is σ = 32047092. Its totient is φ = 12711168.

The previous prime is 20259797. The next prime is 20259809. The reversal of 20259801 is 10895202.

It can be written as a sum of positive squares in 2 ways, for example, as 15397776 + 4862025 = 3924^2 + 2205^2 .

It is not a de Polignac number, because 20259801 - 2² = 20259797 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20259809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5980 + ... + 8733.

Almost surely, 2^20259801 is an apocalyptic number.

It is an amenable number.

20259801 is a deficient number, since it is larger than the sum of its proper divisors (11787291).

20259801 is a wasteful number, since it uses less digits than its factorization.

20259801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14742 (or 14733 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20259801 is about 4501.0888682629. The cubic root of 20259801 is about 272.6120561506.

It can be divided in two parts, 2025 and 9801, that multiplied together give a square (19847025 = 4455²).

The spelling of 20259801 in words is "twenty million, two hundred fifty-nine thousand, eight hundred one".