20938974 has 48 divisors (see below), whose sum is σ = 49488768. Its totient is φ = 5887728.

The previous prime is 20938949. The next prime is 20938997. The reversal of 20938974 is 47983902.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19167 + ... + 20229.

It is an arithmetic number, because the mean of its divisors is an integer number (1031016).

Almost surely, 2^20938974 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20938974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24744384).

20938974 is an abundant number, since it is smaller than the sum of its proper divisors (28549794).

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

20938974 is a wasteful number, since it uses less digits than its factorization.

20938974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149 (or 1142 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 20938974 is about 4575.9123680420. The cubic root of 20938974 is about 275.6249105568.

It can be divided in two parts, 20938 and 974, that added together give a palindrome (21912).

The spelling of 20938974 in words is "twenty million, nine hundred thirty-eight thousand, nine hundred seventy-four".