20201423240 has 32 divisors (see below), whose sum is σ = 46561820760. Its totient is φ = 7883481600.

The previous prime is 20201423197. The next prime is 20201423261. The reversal of 20201423240 is 4232410202.

It can be written as a sum of positive squares in 4 ways, for example, as 7671307396 + 12530115844 = 87586^2 + 111938^2 .

It is a super-2 number, since 2×20201423240² (a number of 21 digits) contains 22 as substring.

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

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, 6157331 + ... + 6160610.

Almost surely, 2^20201423240 is an apocalyptic number.

20201423240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20201423240 is an abundant number, since it is smaller than the sum of its proper divisors (26360397520).

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

20201423240 is a wasteful number, since it uses less digits than its factorization.

20201423240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12317993 (or 12317989 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20201423240 its reverse (4232410202), we get a palindrome (24433833442).

The spelling of 20201423240 in words is "twenty billion, two hundred one million, four hundred twenty-three thousand, two hundred forty".