20540465 has 8 divisors (see below), whose sum is σ = 26889408. Its totient is φ = 14938480.

The previous prime is 20540461. The next prime is 20540477. The reversal of 20540465 is 56404502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20540465 - 2² = 20540461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20540461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186677 + ... + 186786.

It is an arithmetic number, because the mean of its divisors is an integer number (3361176).

Almost surely, 2^20540465 is an apocalyptic number.

It is an amenable number.

20540465 is a deficient number, since it is larger than the sum of its proper divisors (6348943).

20540465 is a wasteful number, since it uses less digits than its factorization.

20540465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373479.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20540465 is about 4532.1589777941. The cubic root of 20540465 is about 273.8651413361.

Adding to 20540465 its reverse (56404502), we get a palindrome (76944967).

The spelling of 20540465 in words is "twenty million, five hundred forty thousand, four hundred sixty-five".