20260999 has 16 divisors (see below), whose sum is σ = 23514624. Its totient is φ = 17274400.

The previous prime is 20260997. The next prime is 20261009. The reversal of 20260999 is 99906202.

It is not a de Polignac number, because 20260999 - 2¹ = 20260997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20260993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12654 + ... + 14164.

It is an arithmetic number, because the mean of its divisors is an integer number (1469664).

Almost surely, 2^20260999 is an apocalyptic number.

20260999 is a deficient number, since it is larger than the sum of its proper divisors (3253625).

20260999 is a wasteful number, since it uses less digits than its factorization.

20260999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 20260999 is about 4501.2219452055. The cubic root of 20260999 is about 272.6174293986.

The spelling of 20260999 in words is "twenty million, two hundred sixty thousand, nine hundred ninety-nine".