20167940 has 24 divisors (see below), whose sum is σ = 45611160. Its totient is φ = 7446528.

The previous prime is 20167913. The next prime is 20167951. The reversal of 20167940 is 4976102.

It can be written as a sum of positive squares in 4 ways, for example, as 222784 + 19945156 = 472^2 + 4466^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38525 + ... + 39044.

It is an arithmetic number, because the mean of its divisors is an integer number (1900465).

Almost surely, 2^20167940 is an apocalyptic number.

20167940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20167940 is an abundant number, since it is smaller than the sum of its proper divisors (25443220).

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

20167940 is a wasteful number, since it uses less digits than its factorization.

20167940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77591 (or 77589 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20167940 is about 4490.8729663619. The cubic root of 20167940 is about 272.1994104321.

The spelling of 20167940 in words is "twenty million, one hundred sixty-seven thousand, nine hundred forty".