20870880 has 48 divisors (see below), whose sum is σ = 65744784. Its totient is φ = 5565440.

The previous prime is 20870879. The next prime is 20870881. The reversal of 20870880 is 8807802.

It is an interprime number because it is at equal distance from previous prime (20870879) and next prime (20870881).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20870881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21261 + ... + 22220.

It is an arithmetic number, because the mean of its divisors is an integer number (1369683).

Almost surely, 2^20870880 is an apocalyptic number.

20870880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20870880 is an abundant number, since it is smaller than the sum of its proper divisors (44873904).

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

20870880 is a wasteful number, since it uses less digits than its factorization.

20870880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43499 (or 43491 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 20870880 is about 4568.4658256356. The cubic root of 20870880 is about 275.3258066850.

The spelling of 20870880 in words is "twenty million, eight hundred seventy thousand, eight hundred eighty".