20929955 has 8 divisors (see below), whose sum is σ = 25542000. Its totient is φ = 16459936.

The previous prime is 20929939. The next prime is 20929957. The reversal of 20929955 is 55992902.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20929955 - 2⁴ = 20929939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20929957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35180 + ... + 35769.

It is an arithmetic number, because the mean of its divisors is an integer number (3192750).

Almost surely, 2^20929955 is an apocalyptic number.

20929955 is a deficient number, since it is larger than the sum of its proper divisors (4612045).

20929955 is an equidigital number, since it uses as much as digits as its factorization.

20929955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71013.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 20929955 is about 4574.9267753703. The cubic root of 20929955 is about 275.5853317620.

The spelling of 20929955 in words is "twenty million, nine hundred twenty-nine thousand, nine hundred fifty-five".