20262453561 has 64 divisors (see below), whose sum is σ = 36822873600. Its totient is φ = 10748049408.

The previous prime is 20262453473. The next prime is 20262453583. The reversal of 20262453561 is 16535426202.

20262453561 is a `hidden beast` number, since 2 + 0 + 2 + 62 + 4 + 535 + 61 = 666.

It is not a de Polignac number, because 20262453561 - 2⁷ = 20262453433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20262493561) 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, 191355 + ... + 277743.

It is an arithmetic number, because the mean of its divisors is an integer number (575357400).

Almost surely, 2^20262453561 is an apocalyptic number.

20262453561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20262453561 is a deficient number, since it is larger than the sum of its proper divisors (16560420039).

20262453561 is a wasteful number, since it uses less digits than its factorization.

20262453561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86495 (or 86489 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 20262453561 its reverse (16535426202), we get a palindrome (36797879763).

The spelling of 20262453561 in words is "twenty billion, two hundred sixty-two million, four hundred fifty-three thousand, five hundred sixty-one".