20899541 has 8 divisors (see below), whose sum is σ = 22542744. Its totient is φ = 19261440.

The previous prime is 20899531. The next prime is 20899559. The reversal of 20899541 is 14599802.

It can be written as a sum of positive squares in 4 ways, for example, as 2709316 + 18190225 = 1646^2 + 4265^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20899541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20899495 and 20899504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20899531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15161 + ... + 16481.

It is an arithmetic number, because the mean of its divisors is an integer number (2817843).

Almost surely, 2^20899541 is an apocalyptic number.

It is an amenable number.

20899541 is a deficient number, since it is larger than the sum of its proper divisors (1643203).

20899541 is a wasteful number, since it uses less digits than its factorization.

20899541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 20899541 is about 4571.6015793155. The cubic root of 20899541 is about 275.4517797080.

The spelling of 20899541 in words is "twenty million, eight hundred ninety-nine thousand, five hundred forty-one".