20986770 has 96 divisors (see below), whose sum is σ = 59971968. Its totient is φ = 4603392.

The previous prime is 20986747. The next prime is 20986817. The reversal of 20986770 is 7768902.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 287454 + ... + 287526.

It is an arithmetic number, because the mean of its divisors is an integer number (624708).

Almost surely, 2^20986770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20986770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29985984).

20986770 is an abundant number, since it is smaller than the sum of its proper divisors (38985198).

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

20986770 is a wasteful number, since it uses less digits than its factorization.

20986770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 20986770 is about 4581.1319561872. The cubic root of 20986770 is about 275.8344680593.

The spelling of 20986770 in words is "twenty million, nine hundred eighty-six thousand, seven hundred seventy".