20966547 has 32 divisors (see below), whose sum is σ = 33804288. Its totient is φ = 11300256.

The previous prime is 20966537. The next prime is 20966551. The reversal of 20966547 is 74566902.

It is not a de Polignac number, because 20966547 - 2¹⁰ = 20965523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20966537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39828 + ... + 40350.

It is an arithmetic number, because the mean of its divisors is an integer number (1056384).

Almost surely, 2^20966547 is an apocalyptic number.

20966547 is a deficient number, since it is larger than the sum of its proper divisors (12837741).

20966547 is a wasteful number, since it uses less digits than its factorization.

20966547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 20966547 is about 4578.9242186348. The cubic root of 20966547 is about 275.7458409045.

The spelling of 20966547 in words is "twenty million, nine hundred sixty-six thousand, five hundred forty-seven".