20642912829 has 64 divisors (see below), whose sum is σ = 38171105280. Its totient is φ = 10711560960.

The previous prime is 20642912809. The next prime is 20642912837. The reversal of 20642912829 is 92821924602.

20642912829 is a `hidden beast` number, since 20 + 64 + 291 + 282 + 9 = 666.

It is not a de Polignac number, because 20642912829 - 2¹³ = 20642904637 is a prime.

It is a super-2 number, since 2×20642912829² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642912809) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2026102 + ... + 2036264.

It is an arithmetic number, because the mean of its divisors is an integer number (596423520).

Almost surely, 2^20642912829 is an apocalyptic number.

It is an amenable number.

20642912829 is a deficient number, since it is larger than the sum of its proper divisors (17528192451).

20642912829 is a wasteful number, since it uses less digits than its factorization.

20642912829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11167 (or 11161 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 20642912829 in words is "twenty billion, six hundred forty-two million, nine hundred twelve thousand, eight hundred twenty-nine".