20146840 has 96 divisors (see below), whose sum is σ = 55609200. Its totient is φ = 6531840.

The previous prime is 20146831. The next prime is 20146927. The reversal of 20146840 is 4864102.

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, 36970 + ... + 37510.

Almost surely, 2^20146840 is an apocalyptic number.

20146840 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 20146840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27804600).

20146840 is an abundant number, since it is smaller than the sum of its proper divisors (35462360).

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

20146840 is a wasteful number, since it uses less digits than its factorization.

20146840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 20146840 is about 4488.5231424156. The cubic root of 20146840 is about 272.1044509457.

The spelling of 20146840 in words is "twenty million, one hundred forty-six thousand, eight hundred forty".