20541021 has 8 divisors (see below), whose sum is σ = 27970944. Its totient is φ = 13402560.

The previous prime is 20541013. The next prime is 20541023. The reversal of 20541021 is 12014502.

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

It is not a de Polignac number, because 20541021 - 2³ = 20541013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20541023) 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, 72700 + ... + 72981.

It is an arithmetic number, because the mean of its divisors is an integer number (3496368).

Almost surely, 2^20541021 is an apocalyptic number.

It is an amenable number.

20541021 is a deficient number, since it is larger than the sum of its proper divisors (7429923).

20541021 is a wasteful number, since it uses less digits than its factorization.

20541021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145731.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 20541021 is about 4532.2203167984. The cubic root of 20541021 is about 273.8676123552.

Adding to 20541021 its reverse (12014502), we get a palindrome (32555523).

The spelling of 20541021 in words is "twenty million, five hundred forty-one thousand, twenty-one".