20581402620 has 48 divisors (see below), whose sum is σ = 57857563008. Its totient is φ = 5466504000.

The previous prime is 20581402607. The next prime is 20581402627. The reversal of 20581402620 is 2620418502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20581402627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 668254 + ... + 698373.

It is an arithmetic number, because the mean of its divisors is an integer number (1205365896).

Almost surely, 2^20581402620 is an apocalyptic number.

20581402620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20581402620 is an abundant number, since it is smaller than the sum of its proper divisors (37276160388).

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

20581402620 is a wasteful number, since it uses less digits than its factorization.

20581402620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366890 (or 1366888 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The spelling of 20581402620 in words is "twenty billion, five hundred eighty-one million, four hundred two thousand, six hundred twenty".