20478438 has 24 divisors (see below), whose sum is σ = 46980648. Its totient is φ = 6424512.

The previous prime is 20478431. The next prime is 20478439. The reversal of 20478438 is 83487402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20478431) 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, 33156 + ... + 33767.

It is an arithmetic number, because the mean of its divisors is an integer number (1957527).

Almost surely, 2^20478438 is an apocalyptic number.

20478438 is an abundant number, since it is smaller than the sum of its proper divisors (26502210).

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

20478438 is a wasteful number, since it uses less digits than its factorization.

20478438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66948 (or 66945 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 20478438 is about 4525.3108180544. The cubic root of 20478438 is about 273.5891956080.

The spelling of 20478438 in words is "twenty million, four hundred seventy-eight thousand, four hundred thirty-eight".