20129292 has 72 divisors (see below), whose sum is σ = 55665792. Its totient is φ = 6105600.

The previous prime is 20129287. The next prime is 20129311. The reversal of 20129292 is 29292102.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18442 + ... + 19502.

It is an arithmetic number, because the mean of its divisors is an integer number (773136).

Almost surely, 2^20129292 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20129292, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27832896).

20129292 is an abundant number, since it is smaller than the sum of its proper divisors (35536500).

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

20129292 is a wasteful number, since it uses less digits than its factorization.

20129292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119 (or 1114 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 20129292 is about 4486.5679533470. The cubic root of 20129292 is about 272.0254265446.

The spelling of 20129292 in words is "twenty million, one hundred twenty-nine thousand, two hundred ninety-two".