20820907029 has 48 divisors (see below), whose sum is σ = 32617762688. Its totient is φ = 11733009408.

The previous prime is 20820907007. The next prime is 20820907057. The reversal of 20820907029 is 92070902802.

It is not a de Polignac number, because 20820907029 - 2¹³ = 20820898837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20820907229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 392064 + ... + 441990.

Almost surely, 2^20820907029 is an apocalyptic number.

It is an amenable number.

20820907029 is a deficient number, since it is larger than the sum of its proper divisors (11796855659).

20820907029 is a wasteful number, since it uses less digits than its factorization.

20820907029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50014 (or 49997 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 20820907029 in words is "twenty billion, eight hundred twenty million, nine hundred seven thousand, twenty-nine".