20401641 has 24 divisors (see below), whose sum is σ = 32517576. Its totient is φ = 12245760.

The previous prime is 20401613. The next prime is 20401663. The reversal of 20401641 is 14610402.

20401641 is a `hidden beast` number, since 20 + 4 + 0 + 1 + 641 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1946025 + 18455616 = 1395^2 + 4296^2 .

It is not a de Polignac number, because 20401641 - 2⁵ = 20401609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20401691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2671 + ... + 6923.

It is an arithmetic number, because the mean of its divisors is an integer number (1354899).

Almost surely, 2^20401641 is an apocalyptic number.

It is an amenable number.

20401641 is a deficient number, since it is larger than the sum of its proper divisors (12115935).

20401641 is a wasteful number, since it uses less digits than its factorization.

20401641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4313 (or 4310 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20401641 is about 4516.8175743548. The cubic root of 20401641 is about 273.2467679804.

The spelling of 20401641 in words is "twenty million, four hundred one thousand, six hundred forty-one".