20975418 has 12 divisors (see below), whose sum is σ = 45446778. Its totient is φ = 6991800.

The previous prime is 20975417. The next prime is 20975441. The reversal of 20975418 is 81457902.

20975418 is a `hidden beast` number, since 20 + 97 + 541 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20820969 + 154449 = 4563^2 + 393^2 .

It is not an unprimeable number, because it can be changed into a prime (20975413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 582633 + ... + 582668.

Almost surely, 2^20975418 is an apocalyptic number.

20975418 is an abundant number, since it is smaller than the sum of its proper divisors (24471360).

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

20975418 is a wasteful number, since it uses less digits than its factorization.

20975418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165309 (or 1165306 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 20975418 is about 4579.8927935051. The cubic root of 20975418 is about 275.7847250127.

The spelling of 20975418 in words is "twenty million, nine hundred seventy-five thousand, four hundred eighteen".