29991020 has 12 divisors (see below), whose sum is σ = 62981184. Its totient is φ = 11996400.

The previous prime is 29991019. The next prime is 29991037. The reversal of 29991020 is 2019992.

It is a super-2 number, since 2×29991020² = 1798922561280800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749756 + ... + 749795.

It is an arithmetic number, because the mean of its divisors is an integer number (5248432).

Almost surely, 2^29991020 is an apocalyptic number.

29991020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29991020 is an abundant number, since it is smaller than the sum of its proper divisors (32990164).

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

29991020 is a wasteful number, since it uses less digits than its factorization.

29991020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499560 (or 1499558 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 29991020 is about 5476.4057556028. The cubic root of 29991020 is about 310.6922442260.

It can be divided in two parts, 299 and 91020, that added together give a palindrome (91319).

The spelling of 29991020 in words is "twenty-nine million, nine hundred ninety-one thousand, twenty".