20454840 has 96 divisors (see below), whose sum is σ = 75984480. Its totient is φ = 4674816.

The previous prime is 20454839. The next prime is 20454853. The reversal of 20454840 is 4845402.

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, 1539 + ... + 6578.

It is an arithmetic number, because the mean of its divisors is an integer number (791505).

Almost surely, 2^20454840 is an apocalyptic number.

20454840 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 20454840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37992240).

20454840 is an abundant number, since it is smaller than the sum of its proper divisors (55529640).

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

20454840 is a wasteful number, since it uses less digits than its factorization.

20454840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8141 (or 8134 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 20454840 is about 4522.7027317744. The cubic root of 20454840 is about 273.4840665074.

The spelling of 20454840 in words is "twenty million, four hundred fifty-four thousand, eight hundred forty".