20626840 has 32 divisors (see below), whose sum is σ = 49981680. Its totient is φ = 7615872.

The previous prime is 20626789. The next prime is 20626841. The reversal of 20626840 is 4862602.

It is a junction number, because it is equal to n+sod(n) for n = 20626799 and 20626808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20626841) 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, 19314 + ... + 20353.

Almost surely, 2^20626840 is an apocalyptic number.

20626840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20626840 is an abundant number, since it is smaller than the sum of its proper divisors (29354840).

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

20626840 is a wasteful number, since it uses less digits than its factorization.

20626840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39691 (or 39687 counting only the distinct ones).

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

The square root of 20626840 is about 4541.6781039611. The cubic root of 20626840 is about 274.2484825662.

The spelling of 20626840 in words is "twenty million, six hundred twenty-six thousand, eight hundred forty".