20780010 has 32 divisors (see below), whose sum is σ = 55414080. Its totient is φ = 5541264.

The previous prime is 20780003. The next prime is 20780033. The reversal of 20780010 is 1008702.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38212 + ... + 38751.

It is an arithmetic number, because the mean of its divisors is an integer number (1731690).

Almost surely, 2^20780010 is an apocalyptic number.

20780010 is an abundant number, since it is smaller than the sum of its proper divisors (34634070).

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

20780010 is a wasteful number, since it uses less digits than its factorization.

20780010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76979 (or 76973 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 20780010 is about 4558.5096248664. The cubic root of 20780010 is about 274.9256438088.

Adding to 20780010 its reverse (1008702), we get a palindrome (21788712).

The spelling of 20780010 in words is "twenty million, seven hundred eighty thousand, ten".