20222020640 has 24 divisors (see below), whose sum is σ = 47774524140. Its totient is φ = 8088808192.

The previous prime is 20222020639. The next prime is 20222020691. The reversal of 20222020640 is 4602022202.

It can be written as a sum of positive squares in 2 ways, for example, as 19699806736 + 522213904 = 140356^2 + 22852^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63193655 + ... + 63193974.

Almost surely, 2^20222020640 is an apocalyptic number.

20222020640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20222020640 is an abundant number, since it is smaller than the sum of its proper divisors (27552503500).

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

20222020640 is a wasteful number, since it uses less digits than its factorization.

20222020640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126387644 (or 126387636 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20222020640 its reverse (4602022202), we get a palindrome (24824042842).

The spelling of 20222020640 in words is "twenty billion, two hundred twenty-two million, twenty thousand, six hundred forty".