20213521040 has 20 divisors (see below), whose sum is σ = 46996436604. Its totient is φ = 8085408384.

The previous prime is 20213521037. The next prime is 20213521049. The reversal of 20213521040 is 4012531202.

It can be written as a sum of positive squares in 2 ways, for example, as 2744083456 + 17469437584 = 52384^2 + 132172^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20213521049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126334427 + ... + 126334586.

Almost surely, 2^20213521040 is an apocalyptic number.

20213521040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20213521040 is an abundant number, since it is smaller than the sum of its proper divisors (26782915564).

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

20213521040 is a wasteful number, since it uses less digits than its factorization.

20213521040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252669026 (or 252669020 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The spelling of 20213521040 in words is "twenty billion, two hundred thirteen million, five hundred twenty-one thousand, forty".