20695509420 has 24 divisors (see below), whose sum is σ = 57947426544. Its totient is φ = 5518802496.

The previous prime is 20695509379. The next prime is 20695509433. The reversal of 20695509420 is 2490559602.

It is a super-2 number, since 2×20695509420² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172462519 + ... + 172462638.

It is an arithmetic number, because the mean of its divisors is an integer number (2414476106).

Almost surely, 2^20695509420 is an apocalyptic number.

20695509420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20695509420 is an abundant number, since it is smaller than the sum of its proper divisors (37251917124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20695509420 is a wasteful number, since it uses less digits than its factorization.

20695509420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344925169 (or 344925167 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 20695509420 in words is "twenty billion, six hundred ninety-five million, five hundred nine thousand, four hundred twenty".