20266840 has 32 divisors (see below), whose sum is σ = 49746960. Its totient is φ = 7369600.

The previous prime is 20266837. The next prime is 20266847. The reversal of 20266840 is 4866202.

It is a junction number, because it is equal to n+sod(n) for n = 20266799 and 20266808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20266847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22591 + ... + 23470.

Almost surely, 2^20266840 is an apocalyptic number.

20266840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20266840 is an abundant number, since it is smaller than the sum of its proper divisors (29480120).

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

20266840 is a wasteful number, since it uses less digits than its factorization.

20266840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46083 (or 46079 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 20266840 is about 4501.8707222665. The cubic root of 20266840 is about 272.6436243131.

The spelling of 20266840 in words is "twenty million, two hundred sixty-six thousand, eight hundred forty".