20820270740 has 24 divisors (see below), whose sum is σ = 44904261192. Its totient is φ = 8103024000.

The previous prime is 20820270739. The next prime is 20820270743. The reversal of 20820270740 is 4707202802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10716804484 + 10103466256 = 103522^2 + 100516^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20820270697 and 20820270706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20820270743) 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, 14067011 + ... + 14068490.

It is an arithmetic number, because the mean of its divisors is an integer number (1871010883).

Almost surely, 2^20820270740 is an apocalyptic number.

20820270740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20820270740 is an abundant number, since it is smaller than the sum of its proper divisors (24083990452).

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

20820270740 is a wasteful number, since it uses less digits than its factorization.

20820270740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28135547 (or 28135545 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The spelling of 20820270740 in words is "twenty billion, eight hundred twenty million, two hundred seventy thousand, seven hundred forty".