20377770 has 64 divisors (see below), whose sum is σ = 58337280. Its totient is φ = 4454208.

The previous prime is 20377759. The next prime is 20377783. The reversal of 20377770 is 7777302.

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 in 31 ways as a sum of consecutive naturals, for example, 2721 + ... + 6939.

It is an arithmetic number, because the mean of its divisors is an integer number (911520).

Almost surely, 2^20377770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20377770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29168640).

20377770 is an abundant number, since it is smaller than the sum of its proper divisors (37959510).

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

20377770 is a wasteful number, since it uses less digits than its factorization.

20377770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4259.

The product of its (nonzero) digits is 14406, while the sum is 33.

The square root of 20377770 is about 4514.1743431108. The cubic root of 20377770 is about 273.1401553275.

The spelling of 20377770 in words is "twenty million, three hundred seventy-seven thousand, seven hundred seventy".