20077678 has 4 divisors (see below), whose sum is σ = 30116520. Its totient is φ = 10038838.

The previous prime is 20077639. The next prime is 20077693. The reversal of 20077678 is 87677002.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20077678² = 806226307743368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5019418 + ... + 5019421.

It is an arithmetic number, because the mean of its divisors is an integer number (7529130).

Almost surely, 2^20077678 is an apocalyptic number.

20077678 is a deficient number, since it is larger than the sum of its proper divisors (10038842).

20077678 is a wasteful number, since it uses less digits than its factorization.

20077678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10038841.

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 20077678 is about 4480.8122031614. The cubic root of 20077678 is about 271.7927252345.

The spelling of 20077678 in words is "twenty million, seventy-seven thousand, six hundred seventy-eight".