20355401 has 4 divisors (see below), whose sum is σ = 22205904. Its totient is φ = 18504900.

The previous prime is 20355373. The next prime is 20355431. The reversal of 20355401 is 10455302.

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 a de Polignac number, because none of the positive numbers 2^k-20355401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20355431) 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, 925235 + ... + 925256.

It is an arithmetic number, because the mean of its divisors is an integer number (5551476).

Almost surely, 2^20355401 is an apocalyptic number.

It is an amenable number.

20355401 is a deficient number, since it is larger than the sum of its proper divisors (1850503).

20355401 is a wasteful number, since it uses less digits than its factorization.

20355401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850502.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20355401 is about 4511.6960225618. The cubic root of 20355401 is about 273.0401753144.

Subtracting from 20355401 its reverse (10455302), we obtain a palindrome (9900099).

The spelling of 20355401 in words is "twenty million, three hundred fifty-five thousand, four hundred one".