20612880 has 100 divisors (see below), whose sum is σ = 71614092. Its totient is φ = 5495040.

The previous prime is 20612869. The next prime is 20612903. The reversal of 20612880 is 8821602.

It can be written as a sum of positive squares in 2 ways, for example, as 4064256 + 16548624 = 2016^2 + 4068^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4890 + ... + 8070.

Almost surely, 2^20612880 is an apocalyptic number.

20612880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20612880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35807046).

20612880 is an abundant number, since it is smaller than the sum of its proper divisors (51001212).

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

20612880 is a wasteful number, since it uses less digits than its factorization.

20612880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206 (or 3191 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20612880 is about 4540.1409669745. The cubic root of 20612880 is about 274.1865992330.

The spelling of 20612880 in words is "twenty million, six hundred twelve thousand, eight hundred eighty".