20974538 has 32 divisors (see below), whose sum is σ = 35707392. Its totient is φ = 9172800.

The previous prime is 20974531. The next prime is 20974553. The reversal of 20974538 is 83547902.

It is not an unprimeable number, because it can be changed into a prime (20974531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42473 + ... + 42963.

It is an arithmetic number, because the mean of its divisors is an integer number (1115856).

Almost surely, 2^20974538 is an apocalyptic number.

20974538 is a deficient number, since it is larger than the sum of its proper divisors (14732854).

20974538 is a wasteful number, since it uses less digits than its factorization.

20974538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20974538 is about 4579.7967203796. The cubic root of 20974538 is about 275.7808682131.

It can be divided in two parts, 20974 and 538, that added together give a palindrome (21512).

The spelling of 20974538 in words is "twenty million, nine hundred seventy-four thousand, five hundred thirty-eight".