20801573 has 4 divisors (see below), whose sum is σ = 22401708. Its totient is φ = 19201440.

The previous prime is 20801567. The next prime is 20801579. The reversal of 20801573 is 37510802.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20801567) and next prime (20801579).

It can be written as a sum of positive squares in 2 ways, for example, as 12837889 + 7963684 = 3583^2 + 2822^2 .

It is a cyclic number.

It is not a de Polignac number, because 20801573 - 2⁸ = 20801317 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 (20801579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800048 + ... + 800073.

It is an arithmetic number, because the mean of its divisors is an integer number (5600427).

Almost surely, 2^20801573 is an apocalyptic number.

It is an amenable number.

20801573 is a deficient number, since it is larger than the sum of its proper divisors (1600135).

20801573 is a wasteful number, since it uses less digits than its factorization.

20801573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600134.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20801573 is about 4560.8741486693. The cubic root of 20801573 is about 275.0207058789.

The spelling of 20801573 in words is "twenty million, eight hundred one thousand, five hundred seventy-three".