20279994 has 32 divisors (see below), whose sum is σ = 47488896. Its totient is φ = 5652480.

The previous prime is 20279993. The next prime is 20280017. The reversal of 20279994 is 49997202.

It is a super-2 number, since 2×20279994² = 822556313280072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20279993) 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, 4167 + ... + 7610.

It is an arithmetic number, because the mean of its divisors is an integer number (1484028).

Almost surely, 2^20279994 is an apocalyptic number.

20279994 is an abundant number, since it is smaller than the sum of its proper divisors (27208902).

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

20279994 is a wasteful number, since it uses less digits than its factorization.

20279994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11830.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 20279994 is about 4503.3314335056. The cubic root of 20279994 is about 272.7025971412.

It can be divided in two parts, 2027 and 9994, that added together give a palindrome (12021).

The spelling of 20279994 in words is "twenty million, two hundred seventy-nine thousand, nine hundred ninety-four".