20761940 has 24 divisors (see below), whose sum is σ = 45007872. Its totient is φ = 8036640.

The previous prime is 20761933. The next prime is 20761963. The reversal of 20761940 is 4916702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16124 + ... + 17363.

It is an arithmetic number, because the mean of its divisors is an integer number (1875328).

Almost surely, 2^20761940 is an apocalyptic number.

20761940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20761940 is an abundant number, since it is smaller than the sum of its proper divisors (24245932).

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

20761940 is a wasteful number, since it uses less digits than its factorization.

20761940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33527 (or 33525 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20761940 is about 4556.5271863559. The cubic root of 20761940 is about 274.8459302269.

The spelling of 20761940 in words is "twenty million, seven hundred sixty-one thousand, nine hundred forty".