20129954 has 8 divisors (see below), whose sum is σ = 32517660. Its totient is φ = 9290736.

The previous prime is 20129953. The next prime is 20129957. The reversal of 20129954 is 45992102.

It can be written as a sum of positive squares in 2 ways, for example, as 20025625 + 104329 = 4475^2 + 323^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 20129954.

It is not an unprimeable number, because it can be changed into a prime (20129951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387089 + ... + 387140.

Almost surely, 2^20129954 is an apocalyptic number.

20129954 is a deficient number, since it is larger than the sum of its proper divisors (12387706).

20129954 is a wasteful number, since it uses less digits than its factorization.

20129954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774244.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 20129954 is about 4486.6417285092. The cubic root of 20129954 is about 272.0284085813.

The spelling of 20129954 in words is "twenty million, one hundred twenty-nine thousand, nine hundred fifty-four".