20258967556 has 9 divisors (see below), whose sum is σ = 35453691399. Its totient is φ = 10129341444.

The previous prime is 20258967551. The next prime is 20258967557. The reversal of 20258967556 is 65576985202.

The square root of 20258967556 is 142334.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×20258967556² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20258967497 and 20258967506.

It is not an unprimeable number, because it can be changed into a prime (20258967551) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 249085 + ... + 320251.

Almost surely, 2^20258967556 is an apocalyptic number.

20258967556 is the 142334-th square number.

It is an amenable number.

20258967556 is a deficient number, since it is larger than the sum of its proper divisors (15194723843).

20258967556 is an frugal number, since it uses more digits than its factorization.

20258967556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142338 (or 71169 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 55.

The spelling of 20258967556 in words is "twenty billion, two hundred fifty-eight million, nine hundred sixty-seven thousand, five hundred fifty-six".