20486840 has 64 divisors (see below), whose sum is σ = 50893920. Its totient is φ = 7360000.

The previous prime is 20486831. The next prime is 20486861. The reversal of 20486840 is 4868402.

It is a super-2 number, since 2×20486840² = 839421226371200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20486797 and 20486806.

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, 44210 + ... + 44670.

Almost surely, 2^20486840 is an apocalyptic number.

20486840 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 20486840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25446960).

20486840 is an abundant number, since it is smaller than the sum of its proper divisors (30407080).

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

20486840 is a wasteful number, since it uses less digits than its factorization.

20486840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 20486840 is about 4526.2390568771. The cubic root of 20486840 is about 273.6266070245.

It can be divided in two parts, 2048 and 6840, that added together give a palindrome (8888).

The spelling of 20486840 in words is "twenty million, four hundred eighty-six thousand, eight hundred forty".