20107770 has 64 divisors (see below), whose sum is σ = 51788160. Its totient is φ = 4978688.

The previous prime is 20107751. The next prime is 20107771. The reversal of 20107770 is 7770102.

It is a self number, because there is not a number n which added to its sum of digits gives 20107770.

It is not an unprimeable number, because it can be changed into a prime (20107771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45169 + ... + 45611.

It is an arithmetic number, because the mean of its divisors is an integer number (809190).

Almost surely, 2^20107770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20107770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25894080).

20107770 is an abundant number, since it is smaller than the sum of its proper divisors (31680390).

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

20107770 is a wasteful number, since it uses less digits than its factorization.

20107770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559.

The product of its (nonzero) digits is 686, while the sum is 24.

The square root of 20107770 is about 4484.1688193020. The cubic root of 20107770 is about 271.9284431865.

Adding to 20107770 its reverse (7770102), we get a palindrome (27877872).

The spelling of 20107770 in words is "twenty million, one hundred seven thousand, seven hundred seventy".