20535121000 has 32 divisors (see below), whose sum is σ = 48052185480. Its totient is φ = 8214048000.

The previous prime is 20535120997. The next prime is 20535121003. The reversal of 20535121000 is 12153502.

It is an interprime number because it is at equal distance from previous prime (20535120997) and next prime (20535121003).

It can be written as a sum of positive squares in 4 ways, for example, as 6342211044 + 14192909956 = 79638^2 + 119134^2 .

It is not an unprimeable number, because it can be changed into a prime (20535121003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10266561 + ... + 10268560.

Almost surely, 2^20535121000 is an apocalyptic number.

20535121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20535121000 is an abundant number, since it is smaller than the sum of its proper divisors (27517064480).

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

20535121000 is a wasteful number, since it uses less digits than its factorization.

20535121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20535142 (or 20535128 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

Adding to 20535121000 its reverse (12153502), we get a palindrome (20547274502).

The spelling of 20535121000 in words is "twenty billion, five hundred thirty-five million, one hundred twenty-one thousand".