20675251556 has 24 divisors (see below), whose sum is σ = 38340855000. Its totient is φ = 9721700352.

The previous prime is 20675251547. The next prime is 20675251591. The reversal of 20675251556 is 65515257602.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10896019456 + 9779232100 = 104384^2 + 98890^2 .

It is a super-2 number, since 2×20675251556² (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, 36785 + ... + 206648.

It is an arithmetic number, because the mean of its divisors is an integer number (1597535625).

Almost surely, 2^20675251556 is an apocalyptic number.

It is an amenable number.

20675251556 is a deficient number, since it is larger than the sum of its proper divisors (17665603444).

20675251556 is a wasteful number, since it uses less digits than its factorization.

20675251556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244703 (or 244701 counting only the distinct ones).

The product of its (nonzero) digits is 630000, while the sum is 44.

The spelling of 20675251556 in words is "twenty billion, six hundred seventy-five million, two hundred fifty-one thousand, five hundred fifty-six".