20780541 has 12 divisors (see below), whose sum is σ = 30139200. Its totient is φ = 13797000.

The previous prime is 20780531. The next prime is 20780549. The reversal of 20780541 is 14508702.

It is not a de Polignac number, because 20780541 - 2¹¹ = 20778493 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20780549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2341 + ... + 6858.

It is an arithmetic number, because the mean of its divisors is an integer number (2511600).

Almost surely, 2^20780541 is an apocalyptic number.

It is an amenable number.

20780541 is a deficient number, since it is larger than the sum of its proper divisors (9358659).

20780541 is a wasteful number, since it uses less digits than its factorization.

20780541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9456 (or 9453 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20780541 is about 4558.5678672144. The cubic root of 20780541 is about 274.9279855509.

It can be divided in two parts, 20780 and 541, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 20780541 in words is "twenty million, seven hundred eighty thousand, five hundred forty-one".