20969478 has 24 divisors (see below), whose sum is σ = 45796608. Its totient is φ = 6934032.

The previous prime is 20969471. The next prime is 20969489. The reversal of 20969478 is 87496902.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20969471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2301 + ... + 6872.

It is an arithmetic number, because the mean of its divisors is an integer number (1908192).

Almost surely, 2^20969478 is an apocalyptic number.

20969478 is an abundant number, since it is smaller than the sum of its proper divisors (24827130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20969478 is a wasteful number, since it uses less digits than its factorization.

20969478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9308 (or 9305 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 20969478 is about 4579.2442607924. The cubic root of 20969478 is about 275.7586895216.

The spelling of 20969478 in words is "twenty million, nine hundred sixty-nine thousand, four hundred seventy-eight".