20229880 has 64 divisors (see below), whose sum is σ = 51840000. Its totient is φ = 7032960.

The previous prime is 20229877. The next prime is 20229893. The reversal of 20229880 is 8892202.

20229880 = T₄₇₁ + T₄₇₂ + ... + T₆₀₈.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9121 + ... + 11119.

It is an arithmetic number, because the mean of its divisors is an integer number (810000).

Almost surely, 2^20229880 is an apocalyptic number.

20229880 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 20229880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25920000).

20229880 is an abundant number, since it is smaller than the sum of its proper divisors (31610120).

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

20229880 is a wasteful number, since it uses less digits than its factorization.

20229880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044 (or 2040 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 20229880 is about 4497.7638888674. The cubic root of 20229880 is about 272.4777862542.

The spelling of 20229880 in words is "twenty million, two hundred twenty-nine thousand, eight hundred eighty".