20401049 has 4 divisors (see below), whose sum is σ = 20875536. Its totient is φ = 19926564.

The previous prime is 20401033. The next prime is 20401057. The reversal of 20401049 is 94010402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20401049 - 2⁴ = 20401033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20401049.

It is not an unprimeable number, because it can be changed into a prime (20401009) 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, 237179 + ... + 237264.

It is an arithmetic number, because the mean of its divisors is an integer number (5218884).

Almost surely, 2^20401049 is an apocalyptic number.

It is an amenable number.

20401049 is a deficient number, since it is larger than the sum of its proper divisors (474487).

20401049 is an equidigital number, since it uses as much as digits as its factorization.

20401049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474486.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20401049 is about 4516.7520410135. The cubic root of 20401049 is about 273.2441249961.

The spelling of 20401049 in words is "twenty million, four hundred one thousand, forty-nine".