20766520 has 32 divisors (see below), whose sum is σ = 49474800. Its totient is φ = 7817728.

The previous prime is 20766479. The next prime is 20766521. The reversal of 20766520 is 2566702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20766521) 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, 14590 + ... + 15949.

Almost surely, 2^20766520 is an apocalyptic number.

20766520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20766520 is an abundant number, since it is smaller than the sum of its proper divisors (28708280).

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

20766520 is a wasteful number, since it uses less digits than its factorization.

20766520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30567 (or 30563 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20766520 is about 4557.0297343774. The cubic root of 20766520 is about 274.8661387079.

The spelling of 20766520 in words is "twenty million, seven hundred sixty-six thousand, five hundred twenty".