20401992 has 96 divisors (see below), whose sum is σ = 60540480. Its totient is φ = 6168960.

The previous prime is 20401973. The next prime is 20402009. The reversal of 20401992 is 29910402.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66303 + ... + 66609.

It is an arithmetic number, because the mean of its divisors is an integer number (630630).

Almost surely, 2^20401992 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 20401992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30270240).

20401992 is an abundant number, since it is smaller than the sum of its proper divisors (40138488).

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

20401992 is a wasteful number, since it uses less digits than its factorization.

20401992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 20401992 is about 4516.8564289780. The cubic root of 20401992 is about 273.2483349959.

The spelling of 20401992 in words is "twenty million, four hundred one thousand, nine hundred ninety-two".