20978116 has 12 divisors (see below), whose sum is σ = 38308032. Its totient is φ = 10032968.

The previous prime is 20978077. The next prime is 20978117. The reversal of 20978116 is 61187902.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20978117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113920 + ... + 114103.

It is an arithmetic number, because the mean of its divisors is an integer number (3192336).

Almost surely, 2^20978116 is an apocalyptic number.

It is an amenable number.

20978116 is a deficient number, since it is larger than the sum of its proper divisors (17329916).

20978116 is a wasteful number, since it uses less digits than its factorization.

20978116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228050 (or 228048 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 20978116 is about 4580.1873324134. The cubic root of 20978116 is about 275.7965489374.

The spelling of 20978116 in words is "twenty million, nine hundred seventy-eight thousand, one hundred sixteen".