20072940 has 24 divisors (see below), whose sum is σ = 56204400. Its totient is φ = 5352768.

The previous prime is 20072939. The next prime is 20072947. The reversal of 20072940 is 4927002.

It is a self number, because there is not a number n which added to its sum of digits gives 20072940.

It is not an unprimeable number, because it can be changed into a prime (20072947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167215 + ... + 167334.

It is an arithmetic number, because the mean of its divisors is an integer number (2341850).

Almost surely, 2^20072940 is an apocalyptic number.

20072940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20072940 is an abundant number, since it is smaller than the sum of its proper divisors (36131460).

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

20072940 is a wasteful number, since it uses less digits than its factorization.

20072940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334561 (or 334559 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20072940 is about 4480.2834731744. The cubic root of 20072940 is about 271.7713440229.

Adding to 20072940 its reverse (4927002), we get a palindrome (24999942).

It can be divided in two parts, 20072 and 940, that added together give a palindrome (21012).

The spelling of 20072940 in words is "twenty million, seventy-two thousand, nine hundred forty".