20151604 has 24 divisors (see below), whose sum is σ = 38763648. Its totient is φ = 9090240.

The previous prime is 20151601. The next prime is 20151617. The reversal of 20151604 is 40615102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20151601) 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, 4357 + ... + 7699.

It is an arithmetic number, because the mean of its divisors is an integer number (1615152).

Almost surely, 2^20151604 is an apocalyptic number.

It is an amenable number.

20151604 is a deficient number, since it is larger than the sum of its proper divisors (18612044).

20151604 is a wasteful number, since it uses less digits than its factorization.

20151604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3495 (or 3493 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20151604 is about 4489.0537978509. The cubic root of 20151604 is about 272.1258968803.

Adding to 20151604 its reverse (40615102), we get a palindrome (60766706).

The spelling of 20151604 in words is "twenty million, one hundred fifty-one thousand, six hundred four".