20036835021 has 16 divisors (see below), whose sum is σ = 30726798464. Its totient is φ = 11376690624.

The previous prime is 20036835019. The next prime is 20036835029. The reversal of 20036835021 is 12053863002.

It is not a de Polignac number, because 20036835021 - 2¹ = 20036835019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20036835021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20036835029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3035350 + ... + 3041943.

It is an arithmetic number, because the mean of its divisors is an integer number (1920424904).

Almost surely, 2^20036835021 is an apocalyptic number.

20036835021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20036835021 is a deficient number, since it is larger than the sum of its proper divisors (10689963443).

20036835021 is a wasteful number, since it uses less digits than its factorization.

20036835021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6077460.

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 20036835021 in words is "twenty billion, thirty-six million, eight hundred thirty-five thousand, twenty-one".