20401761 has 16 divisors (see below), whose sum is σ = 28344960. Its totient is φ = 13036800.

The previous prime is 20401739. The next prime is 20401781. The reversal of 20401761 is 16710402.

It is not a de Polignac number, because 20401761 - 2⁵ = 20401729 is a prime.

It is a super-2 number, since 2×20401761² = 832463703802242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20401721) 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 15 ways as a sum of consecutive naturals, for example, 12361 + ... + 13913.

It is an arithmetic number, because the mean of its divisors is an integer number (1771560).

Almost surely, 2^20401761 is an apocalyptic number.

It is an amenable number.

20401761 is a deficient number, since it is larger than the sum of its proper divisors (7943199).

20401761 is a wasteful number, since it uses less digits than its factorization.

20401761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 20401761 is about 4516.8308580242. The cubic root of 20401761 is about 273.2473037142.

The spelling of 20401761 in words is "twenty million, four hundred one thousand, seven hundred sixty-one".