20626540 has 96 divisors (see below), whose sum is σ = 50621760. Its totient is φ = 6988800.

The previous prime is 20626537. The next prime is 20626547. The reversal of 20626540 is 4562602.

It is not an unprimeable number, because it can be changed into a prime (20626547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 338110 + ... + 338170.

It is an arithmetic number, because the mean of its divisors is an integer number (527310).

Almost surely, 2^20626540 is an apocalyptic number.

20626540 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 20626540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25310880).

20626540 is an abundant number, since it is smaller than the sum of its proper divisors (29995220).

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

20626540 is a wasteful number, since it uses less digits than its factorization.

20626540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20626540 is about 4541.6450764013. The cubic root of 20626540 is about 274.2471529888.

The spelling of 20626540 in words is "twenty million, six hundred twenty-six thousand, five hundred forty".