20778476 has 24 divisors (see below), whose sum is σ = 39943680. Its totient is φ = 9413712.

The previous prime is 20778473. The next prime is 20778487. The reversal of 20778476 is 67487702.

It is not an unprimeable number, because it can be changed into a prime (20778473) 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, 4196 + ... + 7691.

It is an arithmetic number, because the mean of its divisors is an integer number (1664320).

Almost surely, 2^20778476 is an apocalyptic number.

It is an amenable number.

20778476 is a deficient number, since it is larger than the sum of its proper divisors (19165204).

20778476 is a wasteful number, since it uses less digits than its factorization.

20778476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11933 (or 11931 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 41.

The square root of 20778476 is about 4558.3413650143. The cubic root of 20778476 is about 274.9188785519.

The spelling of 20778476 in words is "twenty million, seven hundred seventy-eight thousand, four hundred seventy-six".