20875770 has 48 divisors (see below), whose sum is σ = 55752840. Its totient is φ = 5415552.

The previous prime is 20875759. The next prime is 20875781. The reversal of 20875770 is 7757802.

20875770 is a `hidden beast` number, since 2 + 0 + 87 + 577 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20875759) and next prime (20875781).

It can be written as a sum of positive squares in 4 ways, for example, as 18688329 + 2187441 = 4323^2 + 1479^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196 + ... + 6464.

Almost surely, 2^20875770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20875770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27876420).

20875770 is an abundant number, since it is smaller than the sum of its proper divisors (34877070).

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

20875770 is a wasteful number, since it uses less digits than its factorization.

20875770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6319 (or 6316 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 20875770 is about 4569.0009848981. Note that the first 3 decimals coincide. The cubic root of 20875770 is about 275.3473077439.

The spelling of 20875770 in words is "twenty million, eight hundred seventy-five thousand, seven hundred seventy".