20617401 has 16 divisors (see below), whose sum is σ = 31508864. Its totient is φ = 11746944.

The previous prime is 20617357. The next prime is 20617411. The reversal of 20617401 is 10471602.

It is not a de Polignac number, because 20617401 - 2²² = 16423097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20617411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7101 + ... + 9573.

It is an arithmetic number, because the mean of its divisors is an integer number (1969304).

Almost surely, 2^20617401 is an apocalyptic number.

20617401 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20617401 is a deficient number, since it is larger than the sum of its proper divisors (10891463).

20617401 is a wasteful number, since it uses less digits than its factorization.

20617401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2880.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 20617401 is about 4540.6388317064. The cubic root of 20617401 is about 274.2066434481.

The spelling of 20617401 in words is "twenty million, six hundred seventeen thousand, four hundred one".