20355461 has 4 divisors (see below), whose sum is σ = 23263392. Its totient is φ = 17447532.

The previous prime is 20355431. The next prime is 20355473. The reversal of 20355461 is 16455302.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16455302 = 2 ⋅8227651.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20355461 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 20355461.

It is a congruent 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, 1453955 + ... + 1453968.

It is an arithmetic number, because the mean of its divisors is an integer number (5815848).

Almost surely, 2^20355461 is an apocalyptic number.

It is an amenable number.

20355461 is a deficient number, since it is larger than the sum of its proper divisors (2907931).

20355461 is an equidigital number, since it uses as much as digits as its factorization.

20355461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2907930.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20355461 is about 4511.7026719410. The cubic root of 20355461 is about 273.0404435871.

The spelling of 20355461 in words is "twenty million, three hundred fifty-five thousand, four hundred sixty-one".