20077428 has 24 divisors (see below), whose sum is σ = 53540032. Its totient is φ = 5736384.

The previous prime is 20077427. The next prime is 20077439. The reversal of 20077428 is 82477002.

It is a junction number, because it is equal to n+sod(n) for n = 20077395 and 20077404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20077423) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 119425 + ... + 119592.

Almost surely, 2^20077428 is an apocalyptic number.

20077428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20077428 is an abundant number, since it is smaller than the sum of its proper divisors (33462604).

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

20077428 is a wasteful number, since it uses less digits than its factorization.

20077428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239031 (or 239029 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 20077428 is about 4480.7843063464. The cubic root of 20077428 is about 271.7915971415.

The spelling of 20077428 in words is "twenty million, seventy-seven thousand, four hundred twenty-eight".