20520421629 has 8 divisors (see below), whose sum is σ = 28800591840. Its totient is φ = 12960266256.

The previous prime is 20520421619. The next prime is 20520421637. The reversal of 20520421629 is 92612402502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20520421629 - 2¹⁶ = 20520356093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20520421629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520421619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180003642 + ... + 180003755.

It is an arithmetic number, because the mean of its divisors is an integer number (3600073980).

Almost surely, 2^20520421629 is an apocalyptic number.

It is an amenable number.

20520421629 is a deficient number, since it is larger than the sum of its proper divisors (8280170211).

20520421629 is a wasteful number, since it uses less digits than its factorization.

20520421629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360007419.

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 20520421629 in words is "twenty billion, five hundred twenty million, four hundred twenty-one thousand, six hundred twenty-nine".