29920947 has 16 divisors (see below), whose sum is σ = 46048512. Its totient is φ = 16927200.

The previous prime is 29920883. The next prime is 29920949. The reversal of 29920947 is 74902992.

It is not a de Polignac number, because 29920947 - 2⁶ = 29920883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 29920899 and 29920908.

It is not an unprimeable number, because it can be changed into a prime (29920949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4933 + ... + 9174.

It is an arithmetic number, because the mean of its divisors is an integer number (2878032).

Almost surely, 2^29920947 is an apocalyptic number.

29920947 is a deficient number, since it is larger than the sum of its proper divisors (16127565).

29920947 is a wasteful number, since it uses less digits than its factorization.

29920947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14218.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 29920947 is about 5470.0042961592. The cubic root of 29920947 is about 310.4500815662.

The spelling of 29920947 in words is "twenty-nine million, nine hundred twenty thousand, nine hundred forty-seven".