20415156 has 12 divisors (see below), whose sum is σ = 47635392. Its totient is φ = 6805048.

The previous prime is 20415149. The next prime is 20415163. The reversal of 20415156 is 65151402.

It is an interprime number because it is at equal distance from previous prime (20415149) and next prime (20415163).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850620 + ... + 850643.

It is an arithmetic number, because the mean of its divisors is an integer number (3969616).

Almost surely, 2^20415156 is an apocalyptic number.

It is an amenable number.

20415156 is an abundant number, since it is smaller than the sum of its proper divisors (27220236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20415156 is a wasteful number, since it uses less digits than its factorization.

20415156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701270 (or 1701268 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 20415156 is about 4518.3134021447. The cubic root of 20415156 is about 273.3070918029.

Adding to 20415156 its reverse (65151402), we get a palindrome (85566558).

The spelling of 20415156 in words is "twenty million, four hundred fifteen thousand, one hundred fifty-six".