29920780 has 12 divisors (see below), whose sum is σ = 62833680. Its totient is φ = 11968304.

The previous prime is 29920777. The next prime is 29920823. The reversal of 29920780 is 8702992.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 748000 + ... + 748039.

It is an arithmetic number, because the mean of its divisors is an integer number (5236140).

Almost surely, 2^29920780 is an apocalyptic number.

29920780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29920780 is an abundant number, since it is smaller than the sum of its proper divisors (32912900).

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

29920780 is a wasteful number, since it uses less digits than its factorization.

29920780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496048 (or 1496046 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 29920780 is about 5469.9890310676. The cubic root of 29920780 is about 310.4495039858.

The spelling of 29920780 in words is "twenty-nine million, nine hundred twenty thousand, seven hundred eighty".