20761904 has 10 divisors (see below), whose sum is σ = 40226220. Its totient is φ = 10380944.

The previous prime is 20761901. The next prime is 20761907. The reversal of 20761904 is 40916702.

It is an interprime number because it is at equal distance from previous prime (20761901) and next prime (20761907).

It is not an unprimeable number, because it can be changed into a prime (20761901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648794 + ... + 648825.

It is an arithmetic number, because the mean of its divisors is an integer number (4022622).

Almost surely, 2^20761904 is an apocalyptic number.

It is an amenable number.

20761904 is a deficient number, since it is larger than the sum of its proper divisors (19464316).

20761904 is a wasteful number, since it uses less digits than its factorization.

20761904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297627 (or 1297621 counting only the distinct ones).

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

The square root of 20761904 is about 4556.5232359772. The cubic root of 20761904 is about 274.8457713712.

The spelling of 20761904 in words is "twenty million, seven hundred sixty-one thousand, nine hundred four".