20151992 has 64 divisors (see below), whose sum is σ = 45239040. Its totient is φ = 8236800.

The previous prime is 20151991. The next prime is 20152019. The reversal of 20151992 is 29915102.

It is a super-2 number, since 2×20151992² = 812205563136128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20151991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153767 + ... + 153897.

It is an arithmetic number, because the mean of its divisors is an integer number (706860).

Almost surely, 2^20151992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20151992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22619520).

20151992 is an abundant number, since it is smaller than the sum of its proper divisors (25087048).

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

20151992 is a wasteful number, since it uses less digits than its factorization.

20151992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 20151992 is about 4489.0970138771. The cubic root of 20151992 is about 272.1276433777.

The spelling of 20151992 in words is "twenty million, one hundred fifty-one thousand, nine hundred ninety-two".