20916438 has 16 divisors (see below), whose sum is σ = 41900976. Its totient is φ = 6960800.

The previous prime is 20916421. The next prime is 20916439. The reversal of 20916438 is 83461902.

It is a junction number, because it is equal to n+sod(n) for n = 20916399 and 20916408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20916439) 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, 1720 + ... + 6692.

It is an arithmetic number, because the mean of its divisors is an integer number (2618811).

Almost surely, 2^20916438 is an apocalyptic number.

20916438 is an abundant number, since it is smaller than the sum of its proper divisors (20984538).

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

20916438 is a wasteful number, since it uses less digits than its factorization.

20916438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5679.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 20916438 is about 4573.4492453727. The cubic root of 20916438 is about 275.5259927408.

The spelling of 20916438 in words is "twenty million, nine hundred sixteen thousand, four hundred thirty-eight".