20878338 has 16 divisors (see below), whose sum is σ = 44968896. Its totient is φ = 6424080.

The previous prime is 20878337. The next prime is 20878373. The reversal of 20878338 is 83387802.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20878296 and 20878305.

It is not an unprimeable number, because it can be changed into a prime (20878337) 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, 133758 + ... + 133913.

It is an arithmetic number, because the mean of its divisors is an integer number (2810556).

Almost surely, 2^20878338 is an apocalyptic number.

20878338 is an abundant number, since it is smaller than the sum of its proper divisors (24090558).

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

20878338 is a wasteful number, since it uses less digits than its factorization.

20878338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267689.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 20878338 is about 4569.2820004898. The cubic root of 20878338 is about 275.3585977529.

The spelling of 20878338 in words is "twenty million, eight hundred seventy-eight thousand, three hundred thirty-eight".