20356421052 has 24 divisors (see below), whose sum is σ = 51816344832. Its totient is φ = 6168612400.

The previous prime is 20356421021. The next prime is 20356421053. The reversal of 20356421052 is 25012465302.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356421053) 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, 77107524 + ... + 77107787.

It is an arithmetic number, because the mean of its divisors is an integer number (2159014368).

Almost surely, 2^20356421052 is an apocalyptic number.

20356421052 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20356421052 is an abundant number, since it is smaller than the sum of its proper divisors (31459923780).

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

20356421052 is a wasteful number, since it uses less digits than its factorization.

20356421052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154215329 (or 154215327 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 20356421052 its reverse (25012465302), we get a palindrome (45368886354).

The spelling of 20356421052 in words is "twenty billion, three hundred fifty-six million, four hundred twenty-one thousand, fifty-two".