20402515340 has 24 divisors (see below), whose sum is σ = 43023073632. Its totient is φ = 8127141120.

The previous prime is 20402515333. The next prime is 20402515349. The reversal of 20402515340 is 4351520402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20402515349) 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, 2111624 + ... + 2121263.

It is an arithmetic number, because the mean of its divisors is an integer number (1792628068).

Almost surely, 2^20402515340 is an apocalyptic number.

20402515340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20402515340 is an abundant number, since it is smaller than the sum of its proper divisors (22620558292).

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

20402515340 is a wasteful number, since it uses less digits than its factorization.

20402515340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4233137 (or 4233135 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The spelling of 20402515340 in words is "twenty billion, four hundred two million, five hundred fifteen thousand, three hundred forty".