20615901 has 8 divisors (see below), whose sum is σ = 27603840. Its totient is φ = 13685952.

The previous prime is 20615873. The next prime is 20615909. The reversal of 20615901 is 10951602.

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

It is not a de Polignac number, because 20615901 - 2¹³ = 20607709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20615909) 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, 13660 + ... + 15093.

It is an arithmetic number, because the mean of its divisors is an integer number (3450480).

Almost surely, 2^20615901 is an apocalyptic number.

It is an amenable number.

20615901 is a deficient number, since it is larger than the sum of its proper divisors (6987939).

20615901 is a wasteful number, since it uses less digits than its factorization.

20615901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28995.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 20615901 is about 4540.4736537062. The cubic root of 20615901 is about 274.1999934030.

The spelling of 20615901 in words is "twenty million, six hundred fifteen thousand, nine hundred one".