20898777 has 8 divisors (see below), whose sum is σ = 27892864. Its totient is φ = 13918608.

The previous prime is 20898767. The next prime is 20898793. The reversal of 20898777 is 77789802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20898777 - 2⁷ = 20898649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20898737) 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, 768 + ... + 6510.

It is an arithmetic number, because the mean of its divisors is an integer number (3486608).

Almost surely, 2^20898777 is an apocalyptic number.

It is an amenable number.

20898777 is a deficient number, since it is larger than the sum of its proper divisors (6994087).

20898777 is a wasteful number, since it uses less digits than its factorization.

20898777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6959.

The product of its (nonzero) digits is 395136, while the sum is 48.

The square root of 20898777 is about 4571.5180192142. The cubic root of 20898777 is about 275.4484232112.

The spelling of 20898777 in words is "twenty million, eight hundred ninety-eight thousand, seven hundred seventy-seven".