20290721452 has 12 divisors (see below), whose sum is σ = 37377644920. Its totient is φ = 9611394336.

The previous prime is 20290721359. The next prime is 20290721459. The reversal of 20290721452 is 25412709202.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20290721459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133491513 + ... + 133491664.

Almost surely, 2^20290721452 is an apocalyptic number.

It is an amenable number.

20290721452 is a deficient number, since it is larger than the sum of its proper divisors (17086923468).

20290721452 is a wasteful number, since it uses less digits than its factorization.

20290721452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266983200 (or 266983198 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 20290721452 in words is "twenty billion, two hundred ninety million, seven hundred twenty-one thousand, four hundred fifty-two".