20978546 has 16 divisors (see below), whose sum is σ = 33501600. Its totient is φ = 9823968.

The previous prime is 20978533. The next prime is 20978549. The reversal of 20978546 is 64587902.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20978549) 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, 281 + ... + 6483.

It is an arithmetic number, because the mean of its divisors is an integer number (2093850).

Almost surely, 2^20978546 is an apocalyptic number.

20978546 is a deficient number, since it is larger than the sum of its proper divisors (12523054).

20978546 is a wasteful number, since it uses less digits than its factorization.

20978546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6313.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 20978546 is about 4580.2342734843. The cubic root of 20978546 is about 275.7984333091.

The spelling of 20978546 in words is "twenty million, nine hundred seventy-eight thousand, five hundred forty-six".