20077998 has 8 divisors (see below), whose sum is σ = 40156008. Its totient is φ = 6692664.

The previous prime is 20077997. The next prime is 20077999. The reversal of 20077998 is 89977002.

It is an interprime number because it is at equal distance from previous prime (20077997) and next prime (20077999).

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

20077998 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20077997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1673161 + ... + 1673172.

It is an arithmetic number, because the mean of its divisors is an integer number (5019501).

Almost surely, 2^20077998 is an apocalyptic number.

20077998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20077998 is a wasteful number, since it uses less digits than its factorization.

20077998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3346338.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 20077998 is about 4480.8479108312. The cubic root of 20077998 is about 271.7941691798.

The spelling of 20077998 in words is "twenty million, seventy-seven thousand, nine hundred ninety-eight".