20464940 has 48 divisors (see below), whose sum is σ = 47500992. Its totient is φ = 7366656.

The previous prime is 20464937. The next prime is 20464973. The reversal of 20464940 is 4946402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6512 + ... + 9128.

It is an arithmetic number, because the mean of its divisors is an integer number (989604).

Almost surely, 2^20464940 is an apocalyptic number.

20464940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20464940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23750496).

20464940 is an abundant number, since it is smaller than the sum of its proper divisors (27036052).

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

20464940 is a wasteful number, since it uses less digits than its factorization.

20464940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666 (or 2664 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 20464940 is about 4523.8191829471. The cubic root of 20464940 is about 273.5290719041.

The spelling of 20464940 in words is "twenty million, four hundred sixty-four thousand, nine hundred forty".