20390496 has 96 divisors (see below), whose sum is σ = 64431360. Its totient is φ = 5515776.

The previous prime is 20390483. The next prime is 20390549. The reversal of 20390496 is 69409302.

20390496 = T₂₂₃ + T₂₂₄ + ... + T₅₁₀.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

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, 11970 + ... + 13566.

It is an arithmetic number, because the mean of its divisors is an integer number (671160).

Almost surely, 2^20390496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20390496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32215680).

20390496 is an abundant number, since it is smaller than the sum of its proper divisors (44040864).

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

20390496 is a wasteful number, since it uses less digits than its factorization.

20390496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636 (or 1628 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 20390496 is about 4515.5836832020. The cubic root of 20390496 is about 273.1970025402.

Adding to 20390496 its reverse (69409302), we get a palindrome (89799798).

The spelling of 20390496 in words is "twenty million, three hundred ninety thousand, four hundred ninety-six".