20401029 has 24 divisors (see below), whose sum is σ = 32314464. Its totient is φ = 12300000.

The previous prime is 20401021. The next prime is 20401033. The reversal of 20401029 is 92010402.

It is not a de Polignac number, because 20401029 - 2³ = 20401021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401021) 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 23 ways as a sum of consecutive naturals, for example, 24439 + ... + 25259.

It is an arithmetic number, because the mean of its divisors is an integer number (1346436).

Almost surely, 2^20401029 is an apocalyptic number.

It is an amenable number.

20401029 is a deficient number, since it is larger than the sum of its proper divisors (11913435).

20401029 is a wasteful number, since it uses less digits than its factorization.

20401029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089 (or 1086 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20401029 is about 4516.7498270327. The cubic root of 20401029 is about 273.2440357052.

The spelling of 20401029 in words is "twenty million, four hundred one thousand, twenty-nine".