20401023 has 32 divisors (see below), whose sum is σ = 29855232. Its totient is φ = 12355200.

The previous prime is 20401021. The next prime is 20401033. The reversal of 20401023 is 32010402.

It is not a de Polignac number, because 20401023 - 2¹ = 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 (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155668 + ... + 155798.

It is an arithmetic number, because the mean of its divisors is an integer number (932976).

Almost surely, 2^20401023 is an apocalyptic number.

20401023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20401023 is a deficient number, since it is larger than the sum of its proper divisors (9454209).

20401023 is a wasteful number, since it uses less digits than its factorization.

20401023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20401023 is about 4516.7491628382. The cubic root of 20401023 is about 273.2440089179.

Adding to 20401023 its reverse (32010402), we get a palindrome (52411425).

The spelling of 20401023 in words is "twenty million, four hundred one thousand, twenty-three".