20455780 has 24 divisors (see below), whose sum is σ = 45218880. Its totient is φ = 7751520.

The previous prime is 20455711. The next prime is 20455823. The reversal of 20455780 is 8755402.

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, 26536 + ... + 27295.

It is an arithmetic number, because the mean of its divisors is an integer number (1884120).

Almost surely, 2^20455780 is an apocalyptic number.

20455780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20455780 is an abundant number, since it is smaller than the sum of its proper divisors (24763100).

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

20455780 is a wasteful number, since it uses less digits than its factorization.

20455780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53859 (or 53857 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 20455780 is about 4522.8066507424. The cubic root of 20455780 is about 273.4882557536.

The spelling of 20455780 in words is "twenty million, four hundred fifty-five thousand, seven hundred eighty".