29220720 has 80 divisors (see below), whose sum is σ = 91497120. Its totient is φ = 7713792.

The previous prime is 29220707. The next prime is 29220721. The reversal of 29220720 is 2702292.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29220721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25602 + ... + 26718.

It is an arithmetic number, because the mean of its divisors is an integer number (1143714).

Almost surely, 2^29220720 is an apocalyptic number.

29220720 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 29220720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45748560).

29220720 is an abundant number, since it is smaller than the sum of its proper divisors (62276400).

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

29220720 is a wasteful number, since it uses less digits than its factorization.

29220720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242 (or 1236 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 29220720 is about 5405.6192984708. The cubic root of 29220720 is about 308.0091637235.

It can be divided in two parts, 292 and 20720, that added together give a palindrome (21012).

The spelling of 29220720 in words is "twenty-nine million, two hundred twenty thousand, seven hundred twenty".