20012305240 has 32 divisors (see below), whose sum is σ = 45097339680. Its totient is φ = 7992539392.

The previous prime is 20012305231. The next prime is 20012305249. The reversal of 20012305240 is 4250321002.

It is an interprime number because it is at equal distance from previous prime (20012305231) and next prime (20012305249).

It is a super-2 number, since 2×20012305240² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012305249) 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, 360757 + ... + 412516.

It is an arithmetic number, because the mean of its divisors is an integer number (1409291865).

Almost surely, 2^20012305240 is an apocalyptic number.

20012305240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012305240 is an abundant number, since it is smaller than the sum of its proper divisors (25085034440).

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

20012305240 is a wasteful number, since it uses less digits than its factorization.

20012305240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773931 (or 773927 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 20012305240 its reverse (4250321002), we get a palindrome (24262626242).

The spelling of 20012305240 in words is "twenty billion, twelve million, three hundred five thousand, two hundred forty".