20421140452 has 24 divisors (see below), whose sum is σ = 37852950240. Its totient is φ = 9606449280.

The previous prime is 20421140429. The next prime is 20421140459. The reversal of 20421140452 is 25404112402.

It is not an unprimeable number, because it can be changed into a prime (20421140459) 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, 138427 + ... + 244957.

It is an arithmetic number, because the mean of its divisors is an integer number (1577206260).

Almost surely, 2^20421140452 is an apocalyptic number.

It is an amenable number.

20421140452 is a deficient number, since it is larger than the sum of its proper divisors (17431809788).

20421140452 is a wasteful number, since it uses less digits than its factorization.

20421140452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109371 (or 109369 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 20421140452 its reverse (25404112402), we get a palindrome (45825252854).

The spelling of 20421140452 in words is "twenty billion, four hundred twenty-one million, one hundred forty thousand, four hundred fifty-two".