20415901 has 8 divisors (see below), whose sum is σ = 22359744. Its totient is φ = 18486720.

The previous prime is 20415869. The next prime is 20415911. The reversal of 20415901 is 10951402.

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

It is a cyclic number.

It is not a de Polignac number, because 20415901 - 2⁵ = 20415869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415911) 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, 636 + ... + 6421.

It is an arithmetic number, because the mean of its divisors is an integer number (2794968).

Almost surely, 2^20415901 is an apocalyptic number.

It is an amenable number.

20415901 is a deficient number, since it is larger than the sum of its proper divisors (1943843).

20415901 is a wasteful number, since it uses less digits than its factorization.

20415901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7331.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 20415901 is about 4518.3958436596. The cubic root of 20415901 is about 273.3104163151.

It can be divided in two parts, 20415 and 901, that added together give a square (21316 = 146²).

The spelling of 20415901 in words is "twenty million, four hundred fifteen thousand, nine hundred one".