20277780 has 48 divisors (see below), whose sum is σ = 58169664. Its totient is φ = 5274880.

The previous prime is 20277773. The next prime is 20277793. The reversal of 20277780 is 8777202.

It is a happy number.

It is a super-2 number, since 2×20277780² = 822376723456800, 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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1662 + ... + 6581.

It is an arithmetic number, because the mean of its divisors is an integer number (1211868).

Almost surely, 2^20277780 is an apocalyptic number.

20277780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20277780 is an abundant number, since it is smaller than the sum of its proper divisors (37891884).

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

20277780 is a wasteful number, since it uses less digits than its factorization.

20277780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8296 (or 8294 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 20277780 is about 4503.0856087798. The cubic root of 20277780 is about 272.6926729844.

The spelling of 20277780 in words is "twenty million, two hundred seventy-seven thousand, seven hundred eighty".