20077988 has 24 divisors (see below), whose sum is σ = 41903232. Its totient is φ = 8230464.

The previous prime is 20077979. The next prime is 20077997. The reversal of 20077988 is 88977002.

It is an interprime number because it is at equal distance from previous prime (20077979) and next prime (20077997).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14945 + ... + 16232.

It is an arithmetic number, because the mean of its divisors is an integer number (1745968).

Almost surely, 2^20077988 is an apocalyptic number.

20077988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20077988 is an abundant number, since it is smaller than the sum of its proper divisors (21825244).

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

20077988 is a wasteful number, since it uses less digits than its factorization.

20077988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31211 (or 31209 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 20077988 is about 4480.8467949708. The cubic root of 20077988 is about 271.7941240568.

The spelling of 20077988 in words is "twenty million, seventy-seven thousand, nine hundred eighty-eight".