20989078 has 16 divisors (see below), whose sum is σ = 34418880. Its totient is φ = 9520200.

The previous prime is 20989057. The next prime is 20989093. The reversal of 20989078 is 87098902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15613 + ... + 16903.

It is an arithmetic number, because the mean of its divisors is an integer number (2151180).

Almost surely, 2^20989078 is an apocalyptic number.

20989078 is a deficient number, since it is larger than the sum of its proper divisors (13429802).

20989078 is a wasteful number, since it uses less digits than its factorization.

20989078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 20989078 is about 4581.3838520692. The cubic root of 20989078 is about 275.8445792328.

The spelling of 20989078 in words is "twenty million, nine hundred eighty-nine thousand, seventy-eight".