20435561156 has 6 divisors (see below), whose sum is σ = 35762232030. Its totient is φ = 10217780576.

The previous prime is 20435561117. The next prime is 20435561213. The reversal of 20435561156 is 65116553402.

It can be written as a sum of positive squares in only one way, i.e., 18841954756 + 1593606400 = 137266^2 + 39920^2 .

It is a super-2 number, since 2×20435561156² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2554445141 + ... + 2554445148.

It is an arithmetic number, because the mean of its divisors is an integer number (5960372005).

Almost surely, 2^20435561156 is an apocalyptic number.

It is an amenable number.

20435561156 is a deficient number, since it is larger than the sum of its proper divisors (15326670874).

20435561156 is a wasteful number, since it uses less digits than its factorization.

20435561156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5108890293 (or 5108890291 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 20435561156 in words is "twenty billion, four hundred thirty-five million, five hundred sixty-one thousand, one hundred fifty-six".