20439450 has 72 divisors (see below), whose sum is σ = 56015388. Its totient is φ = 5341440.

The previous prime is 20439449. The next prime is 20439481. The reversal of 20439450 is 5493402.

20439450 is a `hidden beast` number, since 204 + 3 + 9 + 450 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 14722569 + 5716881 = 3837^2 + 2391^2 .

It is a super-2 number, since 2×20439450² = 835542232605000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23422 + ... + 24278.

Almost surely, 2^20439450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20439450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28007694).

20439450 is an abundant number, since it is smaller than the sum of its proper divisors (35575938).

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

20439450 is a wasteful number, since it uses less digits than its factorization.

20439450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20439450 is about 4521.0009953549. Note that the first 3 decimals coincide. The cubic root of 20439450 is about 273.4154604821.

The spelling of 20439450 in words is "twenty million, four hundred thirty-nine thousand, four hundred fifty".