20702451042 has 128 divisors (see below), whose sum is σ = 56677662720. Its totient is φ = 5454630720.

The previous prime is 20702451037. The next prime is 20702451047. The reversal of 20702451042 is 24015420702.

20702451042 is a `hidden beast` number, since 20 + 70 + 24 + 510 + 42 = 666.

It is an interprime number because it is at equal distance from previous prime (20702451037) and next prime (20702451047).

It is a super-4 number, since 4×20702451042⁴ (a number of 42 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20702450997 and 20702451015.

It is not an unprimeable number, because it can be changed into a prime (20702451047) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8957067 + ... + 8959377.

It is an arithmetic number, because the mean of its divisors is an integer number (442794240).

Almost surely, 2^20702451042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20702451042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28338831360).

20702451042 is an abundant number, since it is smaller than the sum of its proper divisors (35975211678).

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

20702451042 is a wasteful number, since it uses less digits than its factorization.

20702451042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165 (or 4159 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

Adding to 20702451042 its reverse (24015420702), we get a palindrome (44717871744).

The spelling of 20702451042 in words is "twenty billion, seven hundred two million, four hundred fifty-one thousand, forty-two".